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Finding the Fourth Proportional to 1,108.65, 1,658.85 and 695.85

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Solution

The fourth proportional to 1,108.65, 1,658.85 and 695.85 is: 1,041.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.65 : 1,658.85 = 695.85 : x
  2. Step 2: Convert to fraction form
    1,108.65/1,658.85 = 695.85/x
  3. Step 3: Cross multiply
    1,108.65x = 1,658.85 × 695.85
  4. Step 4: Simplify right side
    1,108.65x = 1,154,309.03
  5. Step 5: Solve for x
    x = 1,154,309.03/1,108.65
  6. Step 6: Final answer
    x = 1,041.19

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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.