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Finding the Fourth Proportional to 821.48, 1,133.06 and 686.52

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Solution

The fourth proportional to 821.48, 1,133.06 and 686.52 is: 946.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.48 : 1,133.06 = 686.52 : x
  2. Step 2: Convert to fraction form
    821.48/1,133.06 = 686.52/x
  3. Step 3: Cross multiply
    821.48x = 1,133.06 × 686.52
  4. Step 4: Simplify right side
    821.48x = 777,868.35
  5. Step 5: Solve for x
    x = 777,868.35/821.48
  6. Step 6: Final answer
    x = 946.91

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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.