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Finding the Fourth Proportional to 520,087.10, 780,130.65 and 306,635.90

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Solution

The fourth proportional to 520,087.10, 780,130.65 and 306,635.90 is: 459,953.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,087.10 : 780,130.65 = 306,635.90 : x
  2. Step 2: Convert to fraction form
    520,087.10/780,130.65 = 306,635.90/x
  3. Step 3: Cross multiply
    520,087.10x = 780,130.65 × 306,635.90
  4. Step 4: Simplify right side
    520,087.10x = 239,216,063,980.34
  5. Step 5: Solve for x
    x = 239,216,063,980.34/520,087.10
  6. Step 6: Final answer
    x = 459,953.85

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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.