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Finding the Fourth Proportional to 66,603.60, 91,918.80 and 38,318.40

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Solution

The fourth proportional to 66,603.60, 91,918.80 and 38,318.40 is: 52,882.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,603.60 : 91,918.80 = 38,318.40 : x
  2. Step 2: Convert to fraction form
    66,603.60/91,918.80 = 38,318.40/x
  3. Step 3: Cross multiply
    66,603.60x = 91,918.80 × 38,318.40
  4. Step 4: Simplify right side
    66,603.60x = 3,522,181,345.92
  5. Step 5: Solve for x
    x = 3,522,181,345.92/66,603.60
  6. Step 6: Final answer
    x = 52,882.75

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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.