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Finding the Fourth Proportional to 821.70, 1,132.65 and 611.53

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Solution

The fourth proportional to 821.70, 1,132.65 and 611.53 is: 842.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.70 : 1,132.65 = 611.53 : x
  2. Step 2: Convert to fraction form
    821.70/1,132.65 = 611.53/x
  3. Step 3: Cross multiply
    821.70x = 1,132.65 × 611.53
  4. Step 4: Simplify right side
    821.70x = 692,646.62
  5. Step 5: Solve for x
    x = 692,646.62/821.70
  6. Step 6: Final answer
    x = 842.94

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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.