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Finding the Fourth Proportional to 66,291.03, 91,512.90 and 42,431.54

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Solution

The fourth proportional to 66,291.03, 91,512.90 and 42,431.54 is: 58,575.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,291.03 : 91,512.90 = 42,431.54 : x
  2. Step 2: Convert to fraction form
    66,291.03/91,512.90 = 42,431.54/x
  3. Step 3: Cross multiply
    66,291.03x = 91,512.90 × 42,431.54
  4. Step 4: Simplify right side
    66,291.03x = 3,883,032,819.30
  5. Step 5: Solve for x
    x = 3,883,032,819.30/66,291.03
  6. Step 6: Final answer
    x = 58,575.54

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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.