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Finding the Fourth Proportional to 8,760.78, 12,089.76 and 4,781.92

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Solution

The fourth proportional to 8,760.78, 12,089.76 and 4,781.92 is: 6,598.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,760.78 : 12,089.76 = 4,781.92 : x
  2. Step 2: Convert to fraction form
    8,760.78/12,089.76 = 4,781.92/x
  3. Step 3: Cross multiply
    8,760.78x = 12,089.76 × 4,781.92
  4. Step 4: Simplify right side
    8,760.78x = 57,812,265.14
  5. Step 5: Solve for x
    x = 57,812,265.14/8,760.78
  6. Step 6: Final answer
    x = 6,598.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.