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Finding the Fourth Proportional to 128,510.80, 192,766.20 and 86,520.40

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Solution

The fourth proportional to 128,510.80, 192,766.20 and 86,520.40 is: 129,780.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,510.80 : 192,766.20 = 86,520.40 : x
  2. Step 2: Convert to fraction form
    128,510.80/192,766.20 = 86,520.40/x
  3. Step 3: Cross multiply
    128,510.80x = 192,766.20 × 86,520.40
  4. Step 4: Simplify right side
    128,510.80x = 16,678,208,730.48
  5. Step 5: Solve for x
    x = 16,678,208,730.48/128,510.80
  6. Step 6: Final answer
    x = 129,780.60

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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.