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Finding the Fourth Proportional to 807.41, 1,113.20 and 687.66

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Solution

The fourth proportional to 807.41, 1,113.20 and 687.66 is: 948.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.41 : 1,113.20 = 687.66 : x
  2. Step 2: Convert to fraction form
    807.41/1,113.20 = 687.66/x
  3. Step 3: Cross multiply
    807.41x = 1,113.20 × 687.66
  4. Step 4: Simplify right side
    807.41x = 765,503.11
  5. Step 5: Solve for x
    x = 765,503.11/807.41
  6. Step 6: Final answer
    x = 948.10

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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.