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Finding the Fourth Proportional to 1,132.18, 1,696.65 and 644.20

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Solution

The fourth proportional to 1,132.18, 1,696.65 and 644.20 is: 965.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,132.18 : 1,696.65 = 644.20 : x
  2. Step 2: Convert to fraction form
    1,132.18/1,696.65 = 644.20/x
  3. Step 3: Cross multiply
    1,132.18x = 1,696.65 × 644.20
  4. Step 4: Simplify right side
    1,132.18x = 1,092,981.93
  5. Step 5: Solve for x
    x = 1,092,981.93/1,132.18
  6. Step 6: Final answer
    x = 965.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.