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Finding the Fourth Proportional to 807.71, 1,113.95 and 660.08

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Solution

The fourth proportional to 807.71, 1,113.95 and 660.08 is: 910.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.71 : 1,113.95 = 660.08 : x
  2. Step 2: Convert to fraction form
    807.71/1,113.95 = 660.08/x
  3. Step 3: Cross multiply
    807.71x = 1,113.95 × 660.08
  4. Step 4: Simplify right side
    807.71x = 735,300.55
  5. Step 5: Solve for x
    x = 735,300.55/807.71
  6. Step 6: Final answer
    x = 910.36

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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.