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Finding the Fourth Proportional to 113,990.65, 170,989.45 and 39,109.74

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Solution

The fourth proportional to 113,990.65, 170,989.45 and 39,109.74 is: 58,665.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,990.65 : 170,989.45 = 39,109.74 : x
  2. Step 2: Convert to fraction form
    113,990.65/170,989.45 = 39,109.74/x
  3. Step 3: Cross multiply
    113,990.65x = 170,989.45 × 39,109.74
  4. Step 4: Simplify right side
    113,990.65x = 6,687,352,834.47
  5. Step 5: Solve for x
    x = 6,687,352,834.47/113,990.65
  6. Step 6: Final answer
    x = 58,665.80

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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.