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Finding the Fourth Proportional to 1,138.48, 1,707.72 and 408.10

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Solution

The fourth proportional to 1,138.48, 1,707.72 and 408.10 is: 612.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.48 : 1,707.72 = 408.10 : x
  2. Step 2: Convert to fraction form
    1,138.48/1,707.72 = 408.10/x
  3. Step 3: Cross multiply
    1,138.48x = 1,707.72 × 408.10
  4. Step 4: Simplify right side
    1,138.48x = 696,920.53
  5. Step 5: Solve for x
    x = 696,920.53/1,138.48
  6. Step 6: Final answer
    x = 612.15

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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.