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Finding the Fourth Proportional to 1,188.58, 1,640.22 and 691.39

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Solution

The fourth proportional to 1,188.58, 1,640.22 and 691.39 is: 954.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.58 : 1,640.22 = 691.39 : x
  2. Step 2: Convert to fraction form
    1,188.58/1,640.22 = 691.39/x
  3. Step 3: Cross multiply
    1,188.58x = 1,640.22 × 691.39
  4. Step 4: Simplify right side
    1,188.58x = 1,134,031.71
  5. Step 5: Solve for x
    x = 1,134,031.71/1,188.58
  6. Step 6: Final answer
    x = 954.11

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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.