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Finding the Fourth Proportional to 66,355.20, 91,468.80 and 57,446.40

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Solution

The fourth proportional to 66,355.20, 91,468.80 and 57,446.40 is: 79,188.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,355.20 : 91,468.80 = 57,446.40 : x
  2. Step 2: Convert to fraction form
    66,355.20/91,468.80 = 57,446.40/x
  3. Step 3: Cross multiply
    66,355.20x = 91,468.80 × 57,446.40
  4. Step 4: Simplify right side
    66,355.20x = 5,254,553,272.32
  5. Step 5: Solve for x
    x = 5,254,553,272.32/66,355.20
  6. Step 6: Final answer
    x = 79,188.27

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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.