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Finding the Fourth Proportional to 803.95, 1,205.92 and 642.66

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Solution

The fourth proportional to 803.95, 1,205.92 and 642.66 is: 963.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.95 : 1,205.92 = 642.66 : x
  2. Step 2: Convert to fraction form
    803.95/1,205.92 = 642.66/x
  3. Step 3: Cross multiply
    803.95x = 1,205.92 × 642.66
  4. Step 4: Simplify right side
    803.95x = 774,996.55
  5. Step 5: Solve for x
    x = 774,996.55/803.95
  6. Step 6: Final answer
    x = 963.99

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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.