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Finding the Fourth Proportional to 515,779,611.90, 773,669,417.85 and 257,499,285.90

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Solution

The fourth proportional to 515,779,611.90, 773,669,417.85 and 257,499,285.90 is: 386,248,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,779,611.90 : 773,669,417.85 = 257,499,285.90 : x
  2. Step 2: Convert to fraction form
    515,779,611.90/773,669,417.85 = 257,499,285.90/x
  3. Step 3: Cross multiply
    515,779,611.90x = 773,669,417.85 × 257,499,285.90
  4. Step 4: Simplify right side
    515,779,611.90x = 199,219,322,619,043,712
  5. Step 5: Solve for x
    x = 199,219,322,619,043,712/515,779,611.90
  6. Step 6: Final answer
    x = 386,248,928.85

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.