Home / 15,711.47-21,681.98-8,638.04

Finding the Fourth Proportional to 15,711.47, 21,681.98 and 8,638.04

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Solution

The fourth proportional to 15,711.47, 21,681.98 and 8,638.04 is: 11,920.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.47 : 21,681.98 = 8,638.04 : x
  2. Step 2: Convert to fraction form
    15,711.47/21,681.98 = 8,638.04/x
  3. Step 3: Cross multiply
    15,711.47x = 21,681.98 × 8,638.04
  4. Step 4: Simplify right side
    15,711.47x = 187,289,853.93
  5. Step 5: Solve for x
    x = 187,289,853.93/15,711.47
  6. Step 6: Final answer
    x = 11,920.58

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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.