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Finding the Fourth Proportional to 807.85, 1,113.75 and 725.83

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Solution

The fourth proportional to 807.85, 1,113.75 and 725.83 is: 1,000.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.85 : 1,113.75 = 725.83 : x
  2. Step 2: Convert to fraction form
    807.85/1,113.75 = 725.83/x
  3. Step 3: Cross multiply
    807.85x = 1,113.75 × 725.83
  4. Step 4: Simplify right side
    807.85x = 808,393.16
  5. Step 5: Solve for x
    x = 808,393.16/807.85
  6. Step 6: Final answer
    x = 1,000.68

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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.