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Finding the Fourth Proportional to 1,178.13, 1,767.19 and 665.13

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Solution

The fourth proportional to 1,178.13, 1,767.19 and 665.13 is: 997.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.13 : 1,767.19 = 665.13 : x
  2. Step 2: Convert to fraction form
    1,178.13/1,767.19 = 665.13/x
  3. Step 3: Cross multiply
    1,178.13x = 1,767.19 × 665.13
  4. Step 4: Simplify right side
    1,178.13x = 1,175,411.08
  5. Step 5: Solve for x
    x = 1,175,411.08/1,178.13
  6. Step 6: Final answer
    x = 997.69

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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.