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Finding the Fourth Proportional to 1,167.64, 1,751.78 and 387.77

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Solution

The fourth proportional to 1,167.64, 1,751.78 and 387.77 is: 581.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.64 : 1,751.78 = 387.77 : x
  2. Step 2: Convert to fraction form
    1,167.64/1,751.78 = 387.77/x
  3. Step 3: Cross multiply
    1,167.64x = 1,751.78 × 387.77
  4. Step 4: Simplify right side
    1,167.64x = 679,287.73
  5. Step 5: Solve for x
    x = 679,287.73/1,167.64
  6. Step 6: Final answer
    x = 581.76

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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.