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Finding the Fourth Proportional to 1,148.57, 1,586.15 and 981.81

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Solution

The fourth proportional to 1,148.57, 1,586.15 and 981.81 is: 1,355.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.57 : 1,586.15 = 981.81 : x
  2. Step 2: Convert to fraction form
    1,148.57/1,586.15 = 981.81/x
  3. Step 3: Cross multiply
    1,148.57x = 1,586.15 × 981.81
  4. Step 4: Simplify right side
    1,148.57x = 1,557,293.02
  5. Step 5: Solve for x
    x = 1,557,293.02/1,148.57
  6. Step 6: Final answer
    x = 1,355.86

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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.