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Finding the Fourth Proportional to 86,748.80, 130,123.20 and 76,899.20

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Solution

The fourth proportional to 86,748.80, 130,123.20 and 76,899.20 is: 115,348.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,748.80 : 130,123.20 = 76,899.20 : x
  2. Step 2: Convert to fraction form
    86,748.80/130,123.20 = 76,899.20/x
  3. Step 3: Cross multiply
    86,748.80x = 130,123.20 × 76,899.20
  4. Step 4: Simplify right side
    86,748.80x = 10,006,369,981.44
  5. Step 5: Solve for x
    x = 10,006,369,981.44/86,748.80
  6. Step 6: Final answer
    x = 115,348.80

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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.