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Finding the Fourth Proportional to 985.70, 1,360.55 and 691.04

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Solution

The fourth proportional to 985.70, 1,360.55 and 691.04 is: 953.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.70 : 1,360.55 = 691.04 : x
  2. Step 2: Convert to fraction form
    985.70/1,360.55 = 691.04/x
  3. Step 3: Cross multiply
    985.70x = 1,360.55 × 691.04
  4. Step 4: Simplify right side
    985.70x = 940,194.47
  5. Step 5: Solve for x
    x = 940,194.47/985.70
  6. Step 6: Final answer
    x = 953.83

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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.