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Finding the Fourth Proportional to 1,138.55, 1,571.00 and 718.17

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Solution

The fourth proportional to 1,138.55, 1,571.00 and 718.17 is: 990.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.55 : 1,571.00 = 718.17 : x
  2. Step 2: Convert to fraction form
    1,138.55/1,571.00 = 718.17/x
  3. Step 3: Cross multiply
    1,138.55x = 1,571.00 × 718.17
  4. Step 4: Simplify right side
    1,138.55x = 1,128,241.48
  5. Step 5: Solve for x
    x = 1,128,241.48/1,138.55
  6. Step 6: Final answer
    x = 990.95

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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.