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Finding the Fourth Proportional to 1,275.56, 1,913.81 and 658.87

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Solution

The fourth proportional to 1,275.56, 1,913.81 and 658.87 is: 988.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.56 : 1,913.81 = 658.87 : x
  2. Step 2: Convert to fraction form
    1,275.56/1,913.81 = 658.87/x
  3. Step 3: Cross multiply
    1,275.56x = 1,913.81 × 658.87
  4. Step 4: Simplify right side
    1,275.56x = 1,260,943.92
  5. Step 5: Solve for x
    x = 1,260,943.92/1,275.56
  6. Step 6: Final answer
    x = 988.55

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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.