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Finding the Fourth Proportional to 1,121.14, 1,682.18 and 710.17

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Solution

The fourth proportional to 1,121.14, 1,682.18 and 710.17 is: 1,065.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.14 : 1,682.18 = 710.17 : x
  2. Step 2: Convert to fraction form
    1,121.14/1,682.18 = 710.17/x
  3. Step 3: Cross multiply
    1,121.14x = 1,682.18 × 710.17
  4. Step 4: Simplify right side
    1,121.14x = 1,194,633.77
  5. Step 5: Solve for x
    x = 1,194,633.77/1,121.14
  6. Step 6: Final answer
    x = 1,065.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.