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Finding the Fourth Proportional to 1,167.78, 1,751.94 and 387.72

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Solution

The fourth proportional to 1,167.78, 1,751.94 and 387.72 is: 581.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.78 : 1,751.94 = 387.72 : x
  2. Step 2: Convert to fraction form
    1,167.78/1,751.94 = 387.72/x
  3. Step 3: Cross multiply
    1,167.78x = 1,751.94 × 387.72
  4. Step 4: Simplify right side
    1,167.78x = 679,260.24
  5. Step 5: Solve for x
    x = 679,260.24/1,167.78
  6. Step 6: Final answer
    x = 581.67

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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.