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Finding the Fourth Proportional to 109,732.86, 151,431.93 and 61,990.65

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Solution

The fourth proportional to 109,732.86, 151,431.93 and 61,990.65 is: 85,547.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,732.86 : 151,431.93 = 61,990.65 : x
  2. Step 2: Convert to fraction form
    109,732.86/151,431.93 = 61,990.65/x
  3. Step 3: Cross multiply
    109,732.86x = 151,431.93 × 61,990.65
  4. Step 4: Simplify right side
    109,732.86x = 9,387,363,771.45
  5. Step 5: Solve for x
    x = 9,387,363,771.45/109,732.86
  6. Step 6: Final answer
    x = 85,547.43

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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.