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Finding the Fourth Proportional to 1,239.57, 1,857.80 and 545.81

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Solution

The fourth proportional to 1,239.57, 1,857.80 and 545.81 is: 818.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.57 : 1,857.80 = 545.81 : x
  2. Step 2: Convert to fraction form
    1,239.57/1,857.80 = 545.81/x
  3. Step 3: Cross multiply
    1,239.57x = 1,857.80 × 545.81
  4. Step 4: Simplify right side
    1,239.57x = 1,013,997.89
  5. Step 5: Solve for x
    x = 1,013,997.89/1,239.57
  6. Step 6: Final answer
    x = 818.02

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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.