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Finding the Fourth Proportional to 128,521.80, 192,782.70 and 86,531.40

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Solution

The fourth proportional to 128,521.80, 192,782.70 and 86,531.40 is: 129,797.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,521.80 : 192,782.70 = 86,531.40 : x
  2. Step 2: Convert to fraction form
    128,521.80/192,782.70 = 86,531.40/x
  3. Step 3: Cross multiply
    128,521.80x = 192,782.70 × 86,531.40
  4. Step 4: Simplify right side
    128,521.80x = 16,681,756,926.78
  5. Step 5: Solve for x
    x = 16,681,756,926.78/128,521.80
  6. Step 6: Final answer
    x = 129,797.10

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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.