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Finding the Fourth Proportional to 1,188.93, 1,640.67 and 691.53

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Solution

The fourth proportional to 1,188.93, 1,640.67 and 691.53 is: 954.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.93 : 1,640.67 = 691.53 : x
  2. Step 2: Convert to fraction form
    1,188.93/1,640.67 = 691.53/x
  3. Step 3: Cross multiply
    1,188.93x = 1,640.67 × 691.53
  4. Step 4: Simplify right side
    1,188.93x = 1,134,572.53
  5. Step 5: Solve for x
    x = 1,134,572.53/1,188.93
  6. Step 6: Final answer
    x = 954.28

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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.