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Finding the Fourth Proportional to 403,920.40, 605,909.40 and 123,437.20

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Solution

The fourth proportional to 403,920.40, 605,909.40 and 123,437.20 is: 185,164.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,920.40 : 605,909.40 = 123,437.20 : x
  2. Step 2: Convert to fraction form
    403,920.40/605,909.40 = 123,437.20/x
  3. Step 3: Cross multiply
    403,920.40x = 605,909.40 × 123,437.20
  4. Step 4: Simplify right side
    403,920.40x = 74,791,759,789.68
  5. Step 5: Solve for x
    x = 74,791,759,789.68/403,920.40
  6. Step 6: Final answer
    x = 185,164.60

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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.