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Finding the Fourth Proportional to 1,120.17, 1,680.28 and 661.17

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Solution

The fourth proportional to 1,120.17, 1,680.28 and 661.17 is: 991.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.17 : 1,680.28 = 661.17 : x
  2. Step 2: Convert to fraction form
    1,120.17/1,680.28 = 661.17/x
  3. Step 3: Cross multiply
    1,120.17x = 1,680.28 × 661.17
  4. Step 4: Simplify right side
    1,120.17x = 1,110,950.73
  5. Step 5: Solve for x
    x = 1,110,950.73/1,120.17
  6. Step 6: Final answer
    x = 991.77

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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.