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Finding the Fourth Proportional to 821.40, 1,131.26 and 710.83

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Solution

The fourth proportional to 821.40, 1,131.26 and 710.83 is: 978.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.40 : 1,131.26 = 710.83 : x
  2. Step 2: Convert to fraction form
    821.40/1,131.26 = 710.83/x
  3. Step 3: Cross multiply
    821.40x = 1,131.26 × 710.83
  4. Step 4: Simplify right side
    821.40x = 804,133.55
  5. Step 5: Solve for x
    x = 804,133.55/821.40
  6. Step 6: Final answer
    x = 978.98

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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.