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Finding the Fourth Proportional to 1,153.76, 1,730.63 and 691.68

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Solution

The fourth proportional to 1,153.76, 1,730.63 and 691.68 is: 1,037.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.76 : 1,730.63 = 691.68 : x
  2. Step 2: Convert to fraction form
    1,153.76/1,730.63 = 691.68/x
  3. Step 3: Cross multiply
    1,153.76x = 1,730.63 × 691.68
  4. Step 4: Simplify right side
    1,153.76x = 1,197,042.16
  5. Step 5: Solve for x
    x = 1,197,042.16/1,153.76
  6. Step 6: Final answer
    x = 1,037.51

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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.