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Finding the Fourth Proportional to 1,311.56, 1,967.28 and 387.08

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Solution

The fourth proportional to 1,311.56, 1,967.28 and 387.08 is: 580.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.56 : 1,967.28 = 387.08 : x
  2. Step 2: Convert to fraction form
    1,311.56/1,967.28 = 387.08/x
  3. Step 3: Cross multiply
    1,311.56x = 1,967.28 × 387.08
  4. Step 4: Simplify right side
    1,311.56x = 761,494.74
  5. Step 5: Solve for x
    x = 761,494.74/1,311.56
  6. Step 6: Final answer
    x = 580.60

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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.