Home / 20,681.72-28,541.40-12,728.60

Finding the Fourth Proportional to 20,681.72, 28,541.40 and 12,728.60

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Solution

The fourth proportional to 20,681.72, 28,541.40 and 12,728.60 is: 17,565.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.72 : 28,541.40 = 12,728.60 : x
  2. Step 2: Convert to fraction form
    20,681.72/28,541.40 = 12,728.60/x
  3. Step 3: Cross multiply
    20,681.72x = 28,541.40 × 12,728.60
  4. Step 4: Simplify right side
    20,681.72x = 363,292,064.04
  5. Step 5: Solve for x
    x = 363,292,064.04/20,681.72
  6. Step 6: Final answer
    x = 17,565.85

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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.