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Finding the Fourth Proportional to 140,781.53, 211,128.14 and 45,990.11

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Solution

The fourth proportional to 140,781.53, 211,128.14 and 45,990.11 is: 68,970.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,781.53 : 211,128.14 = 45,990.11 : x
  2. Step 2: Convert to fraction form
    140,781.53/211,128.14 = 45,990.11/x
  3. Step 3: Cross multiply
    140,781.53x = 211,128.14 × 45,990.11
  4. Step 4: Simplify right side
    140,781.53x = 9,709,806,766.80
  5. Step 5: Solve for x
    x = 9,709,806,766.80/140,781.53
  6. Step 6: Final answer
    x = 68,970.74

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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.