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Finding the Fourth Proportional to 123,988.93, 185,803.90 and 85,480.91

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Solution

The fourth proportional to 123,988.93, 185,803.90 and 85,480.91 is: 128,097.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,988.93 : 185,803.90 = 85,480.91 : x
  2. Step 2: Convert to fraction form
    123,988.93/185,803.90 = 85,480.91/x
  3. Step 3: Cross multiply
    123,988.93x = 185,803.90 × 85,480.91
  4. Step 4: Simplify right side
    123,988.93x = 15,882,686,453.55
  5. Step 5: Solve for x
    x = 15,882,686,453.55/123,988.93
  6. Step 6: Final answer
    x = 128,097.62

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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.