Home / 20,871.14-28,805.12-12,915.92

Finding the Fourth Proportional to 20,871.14, 28,805.12 and 12,915.92

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Solution

The fourth proportional to 20,871.14, 28,805.12 and 12,915.92 is: 17,825.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.14 : 28,805.12 = 12,915.92 : x
  2. Step 2: Convert to fraction form
    20,871.14/28,805.12 = 12,915.92/x
  3. Step 3: Cross multiply
    20,871.14x = 28,805.12 × 12,915.92
  4. Step 4: Simplify right side
    20,871.14x = 372,044,681.38
  5. Step 5: Solve for x
    x = 372,044,681.38/20,871.14
  6. Step 6: Final answer
    x = 17,825.80

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1.5x scale

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.