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Finding the Fourth Proportional to 20,681.52, 28,540.80 and 12,719.04

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Solution

The fourth proportional to 20,681.52, 28,540.80 and 12,719.04 is: 17,552.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.52 : 28,540.80 = 12,719.04 : x
  2. Step 2: Convert to fraction form
    20,681.52/28,540.80 = 12,719.04/x
  3. Step 3: Cross multiply
    20,681.52x = 28,540.80 × 12,719.04
  4. Step 4: Simplify right side
    20,681.52x = 363,011,576.83
  5. Step 5: Solve for x
    x = 363,011,576.83/20,681.52
  6. Step 6: Final answer
    x = 17,552.46

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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.