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Finding the Fourth Proportional to 90,432.86, 135,631.53 and 66,518.01

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Solution

The fourth proportional to 90,432.86, 135,631.53 and 66,518.01 is: 99,763.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,432.86 : 135,631.53 = 66,518.01 : x
  2. Step 2: Convert to fraction form
    90,432.86/135,631.53 = 66,518.01/x
  3. Step 3: Cross multiply
    90,432.86x = 135,631.53 × 66,518.01
  4. Step 4: Simplify right side
    90,432.86x = 9,021,939,468.86
  5. Step 5: Solve for x
    x = 9,021,939,468.86/90,432.86
  6. Step 6: Final answer
    x = 99,763.96

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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.