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Finding the Fourth Proportional to 402,428.40, 603,642.60 and 121,909.20

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Solution

The fourth proportional to 402,428.40, 603,642.60 and 121,909.20 is: 182,863.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,428.40 : 603,642.60 = 121,909.20 : x
  2. Step 2: Convert to fraction form
    402,428.40/603,642.60 = 121,909.20/x
  3. Step 3: Cross multiply
    402,428.40x = 603,642.60 × 121,909.20
  4. Step 4: Simplify right side
    402,428.40x = 73,589,586,451.92
  5. Step 5: Solve for x
    x = 73,589,586,451.92/402,428.40
  6. Step 6: Final answer
    x = 182,863.80

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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.