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Finding the Fourth Proportional to 1,178.56, 1,767.60 and 438

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Solution

The fourth proportional to 1,178.56, 1,767.60 and 438 is: 656.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.56 : 1,767.60 = 438 : x
  2. Step 2: Convert to fraction form
    1,178.56/1,767.60 = 438/x
  3. Step 3: Cross multiply
    1,178.56x = 1,767.60 × 438
  4. Step 4: Simplify right side
    1,178.56x = 774,208.80
  5. Step 5: Solve for x
    x = 774,208.80/1,178.56
  6. Step 6: Final answer
    x = 656.91

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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.