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Finding the Fourth Proportional to 86,602.40, 129,684.90 and 82,665.80

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Solution

The fourth proportional to 86,602.40, 129,684.90 and 82,665.80 is: 123,789.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,602.40 : 129,684.90 = 82,665.80 : x
  2. Step 2: Convert to fraction form
    86,602.40/129,684.90 = 82,665.80/x
  3. Step 3: Cross multiply
    86,602.40x = 129,684.90 × 82,665.80
  4. Step 4: Simplify right side
    86,602.40x = 10,720,506,006.42
  5. Step 5: Solve for x
    x = 10,720,506,006.42/86,602.40
  6. Step 6: Final answer
    x = 123,789.94

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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.