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Finding the Fourth Proportional to 1,291.72, 1,937.66 and 354.80

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Solution

The fourth proportional to 1,291.72, 1,937.66 and 354.80 is: 532.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.72 : 1,937.66 = 354.80 : x
  2. Step 2: Convert to fraction form
    1,291.72/1,937.66 = 354.80/x
  3. Step 3: Cross multiply
    1,291.72x = 1,937.66 × 354.80
  4. Step 4: Simplify right side
    1,291.72x = 687,481.77
  5. Step 5: Solve for x
    x = 687,481.77/1,291.72
  6. Step 6: Final answer
    x = 532.22

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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.