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Finding the Fourth Proportional to 806.87, 1,113.12 and 571.16

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Solution

The fourth proportional to 806.87, 1,113.12 and 571.16 is: 787.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.87 : 1,113.12 = 571.16 : x
  2. Step 2: Convert to fraction form
    806.87/1,113.12 = 571.16/x
  3. Step 3: Cross multiply
    806.87x = 1,113.12 × 571.16
  4. Step 4: Simplify right side
    806.87x = 635,772.40
  5. Step 5: Solve for x
    x = 635,772.40/806.87
  6. Step 6: Final answer
    x = 787.95

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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.