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Finding the Fourth Proportional to 66,390.48, 99,585.72 and 54,679.12

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Solution

The fourth proportional to 66,390.48, 99,585.72 and 54,679.12 is: 82,018.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,390.48 : 99,585.72 = 54,679.12 : x
  2. Step 2: Convert to fraction form
    66,390.48/99,585.72 = 54,679.12/x
  3. Step 3: Cross multiply
    66,390.48x = 99,585.72 × 54,679.12
  4. Step 4: Simplify right side
    66,390.48x = 5,445,259,534.17
  5. Step 5: Solve for x
    x = 5,445,259,534.17/66,390.48
  6. Step 6: Final answer
    x = 82,018.68

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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.