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Finding the Fourth Proportional to 820.02, 1,131.92 and 686.98

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Solution

The fourth proportional to 820.02, 1,131.92 and 686.98 is: 948.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.02 : 1,131.92 = 686.98 : x
  2. Step 2: Convert to fraction form
    820.02/1,131.92 = 686.98/x
  3. Step 3: Cross multiply
    820.02x = 1,131.92 × 686.98
  4. Step 4: Simplify right side
    820.02x = 777,610.82
  5. Step 5: Solve for x
    x = 777,610.82/820.02
  6. Step 6: Final answer
    x = 948.28

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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.