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Finding the Fourth Proportional to 985.16, 1,358.87 and 748.58

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Solution

The fourth proportional to 985.16, 1,358.87 and 748.58 is: 1,032.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.16 : 1,358.87 = 748.58 : x
  2. Step 2: Convert to fraction form
    985.16/1,358.87 = 748.58/x
  3. Step 3: Cross multiply
    985.16x = 1,358.87 × 748.58
  4. Step 4: Simplify right side
    985.16x = 1,017,228.17
  5. Step 5: Solve for x
    x = 1,017,228.17/985.16
  6. Step 6: Final answer
    x = 1,032.55

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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.