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Finding the Fourth Proportional to 520,112.80, 780,169.20 and 425,634.40

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Solution

The fourth proportional to 520,112.80, 780,169.20 and 425,634.40 is: 638,451.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,112.80 : 780,169.20 = 425,634.40 : x
  2. Step 2: Convert to fraction form
    520,112.80/780,169.20 = 425,634.40/x
  3. Step 3: Cross multiply
    520,112.80x = 780,169.20 × 425,634.40
  4. Step 4: Simplify right side
    520,112.80x = 332,066,849,340.48
  5. Step 5: Solve for x
    x = 332,066,849,340.48/520,112.80
  6. Step 6: Final answer
    x = 638,451.60

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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.