Home / 20,988-28,966.68-12,602.88

Finding the Fourth Proportional to 20,988, 28,966.68 and 12,602.88

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Solution

The fourth proportional to 20,988, 28,966.68 and 12,602.88 is: 17,393.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988 : 28,966.68 = 12,602.88 : x
  2. Step 2: Convert to fraction form
    20,988/28,966.68 = 12,602.88/x
  3. Step 3: Cross multiply
    20,988x = 28,966.68 × 12,602.88
  4. Step 4: Simplify right side
    20,988x = 365,063,592.04
  5. Step 5: Solve for x
    x = 365,063,592.04/20,988
  6. Step 6: Final answer
    x = 17,393.92

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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.