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Finding the Fourth Proportional to 12,666.78, 18,988.02 and 8,287.92

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Solution

The fourth proportional to 12,666.78, 18,988.02 and 8,287.92 is: 12,423.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,666.78 : 18,988.02 = 8,287.92 : x
  2. Step 2: Convert to fraction form
    12,666.78/18,988.02 = 8,287.92/x
  3. Step 3: Cross multiply
    12,666.78x = 18,988.02 × 8,287.92
  4. Step 4: Simplify right side
    12,666.78x = 157,371,190.72
  5. Step 5: Solve for x
    x = 157,371,190.72/12,666.78
  6. Step 6: Final answer
    x = 12,423.93

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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.