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Finding the Fourth Proportional to 66,520.76, 99,728.14 and 38,408.93

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Solution

The fourth proportional to 66,520.76, 99,728.14 and 38,408.93 is: 57,582.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,520.76 : 99,728.14 = 38,408.93 : x
  2. Step 2: Convert to fraction form
    66,520.76/99,728.14 = 38,408.93/x
  3. Step 3: Cross multiply
    66,520.76x = 99,728.14 × 38,408.93
  4. Step 4: Simplify right side
    66,520.76x = 3,830,450,553.63
  5. Step 5: Solve for x
    x = 3,830,450,553.63/66,520.76
  6. Step 6: Final answer
    x = 57,582.79

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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.