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Finding the Fourth Proportional to 57,136.72, 85,718.40 and 17,691.72

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Solution

The fourth proportional to 57,136.72, 85,718.40 and 17,691.72 is: 26,541.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,136.72 : 85,718.40 = 17,691.72 : x
  2. Step 2: Convert to fraction form
    57,136.72/85,718.40 = 17,691.72/x
  3. Step 3: Cross multiply
    57,136.72x = 85,718.40 × 17,691.72
  4. Step 4: Simplify right side
    57,136.72x = 1,516,505,931.65
  5. Step 5: Solve for x
    x = 1,516,505,931.65/57,136.72
  6. Step 6: Final answer
    x = 26,541.70

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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.