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Finding the Fourth Proportional to 1,108.28, 1,529.16 and 715.22

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Solution

The fourth proportional to 1,108.28, 1,529.16 and 715.22 is: 986.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.28 : 1,529.16 = 715.22 : x
  2. Step 2: Convert to fraction form
    1,108.28/1,529.16 = 715.22/x
  3. Step 3: Cross multiply
    1,108.28x = 1,529.16 × 715.22
  4. Step 4: Simplify right side
    1,108.28x = 1,093,685.82
  5. Step 5: Solve for x
    x = 1,093,685.82/1,108.28
  6. Step 6: Final answer
    x = 986.83

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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.