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Finding the Fourth Proportional to 12,488.64, 18,711.04 and 11,132.80

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Solution

The fourth proportional to 12,488.64, 18,711.04 and 11,132.80 is: 16,679.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,488.64 : 18,711.04 = 11,132.80 : x
  2. Step 2: Convert to fraction form
    12,488.64/18,711.04 = 11,132.80/x
  3. Step 3: Cross multiply
    12,488.64x = 18,711.04 × 11,132.80
  4. Step 4: Simplify right side
    12,488.64x = 208,306,266.11
  5. Step 5: Solve for x
    x = 208,306,266.11/12,488.64
  6. Step 6: Final answer
    x = 16,679.66

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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.