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Finding the Fourth Proportional to 1,109.76, 1,531.32 and 690

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Solution

The fourth proportional to 1,109.76, 1,531.32 and 690 is: 952.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.76 : 1,531.32 = 690 : x
  2. Step 2: Convert to fraction form
    1,109.76/1,531.32 = 690/x
  3. Step 3: Cross multiply
    1,109.76x = 1,531.32 × 690
  4. Step 4: Simplify right side
    1,109.76x = 1,056,610.80
  5. Step 5: Solve for x
    x = 1,056,610.80/1,109.76
  6. Step 6: Final answer
    x = 952.11

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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.