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Finding the Fourth Proportional to 66,490.40, 99,735.60 and 57,742.40

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Solution

The fourth proportional to 66,490.40, 99,735.60 and 57,742.40 is: 86,613.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,490.40 : 99,735.60 = 57,742.40 : x
  2. Step 2: Convert to fraction form
    66,490.40/99,735.60 = 57,742.40/x
  3. Step 3: Cross multiply
    66,490.40x = 99,735.60 × 57,742.40
  4. Step 4: Simplify right side
    66,490.40x = 5,758,972,909.44
  5. Step 5: Solve for x
    x = 5,758,972,909.44/66,490.40
  6. Step 6: Final answer
    x = 86,613.60

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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.