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Finding the Fourth Proportional to 8,663.51, 12,988.66 and 7,178.17

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Solution

The fourth proportional to 8,663.51, 12,988.66 and 7,178.17 is: 10,761.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,663.51 : 12,988.66 = 7,178.17 : x
  2. Step 2: Convert to fraction form
    8,663.51/12,988.66 = 7,178.17/x
  3. Step 3: Cross multiply
    8,663.51x = 12,988.66 × 7,178.17
  4. Step 4: Simplify right side
    8,663.51x = 93,234,832.20
  5. Step 5: Solve for x
    x = 93,234,832.20/8,663.51
  6. Step 6: Final answer
    x = 10,761.78

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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.