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Finding the Fourth Proportional to 56,728.80, 85,096.40 and 17,287.20

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Solution

The fourth proportional to 56,728.80, 85,096.40 and 17,287.20 is: 25,931.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,728.80 : 85,096.40 = 17,287.20 : x
  2. Step 2: Convert to fraction form
    56,728.80/85,096.40 = 17,287.20/x
  3. Step 3: Cross multiply
    56,728.80x = 85,096.40 × 17,287.20
  4. Step 4: Simplify right side
    56,728.80x = 1,471,078,486.08
  5. Step 5: Solve for x
    x = 1,471,078,486.08/56,728.80
  6. Step 6: Final answer
    x = 25,931.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.