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Finding the Fourth Proportional to 18,762.82, 25,862.66 and 12,711.20

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Solution

The fourth proportional to 18,762.82, 25,862.66 and 12,711.20 is: 17,521.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,762.82 : 25,862.66 = 12,711.20 : x
  2. Step 2: Convert to fraction form
    18,762.82/25,862.66 = 12,711.20/x
  3. Step 3: Cross multiply
    18,762.82x = 25,862.66 × 12,711.20
  4. Step 4: Simplify right side
    18,762.82x = 328,745,443.79
  5. Step 5: Solve for x
    x = 328,745,443.79/18,762.82
  6. Step 6: Final answer
    x = 17,521.11

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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.