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Finding the Fourth Proportional to 129,987.40, 194,981.10 and 74,000.20

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Solution

The fourth proportional to 129,987.40, 194,981.10 and 74,000.20 is: 111,000.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,987.40 : 194,981.10 = 74,000.20 : x
  2. Step 2: Convert to fraction form
    129,987.40/194,981.10 = 74,000.20/x
  3. Step 3: Cross multiply
    129,987.40x = 194,981.10 × 74,000.20
  4. Step 4: Simplify right side
    129,987.40x = 14,428,640,396.22
  5. Step 5: Solve for x
    x = 14,428,640,396.22/129,987.40
  6. Step 6: Final answer
    x = 111,000.30

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1.5x scale

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.