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Finding the Fourth Proportional to 219,499.78, 302,903.50 and 128,854.30

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Solution

The fourth proportional to 219,499.78, 302,903.50 and 128,854.30 is: 177,815.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,499.78 : 302,903.50 = 128,854.30 : x
  2. Step 2: Convert to fraction form
    219,499.78/302,903.50 = 128,854.30/x
  3. Step 3: Cross multiply
    219,499.78x = 302,903.50 × 128,854.30
  4. Step 4: Simplify right side
    219,499.78x = 39,030,417,380.66
  5. Step 5: Solve for x
    x = 39,030,417,380.66/219,499.78
  6. Step 6: Final answer
    x = 177,815.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.