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Finding the Fourth Proportional to 772.40, 1,158.60 and 387.56

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Solution

The fourth proportional to 772.40, 1,158.60 and 387.56 is: 581.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.40 : 1,158.60 = 387.56 : x
  2. Step 2: Convert to fraction form
    772.40/1,158.60 = 387.56/x
  3. Step 3: Cross multiply
    772.40x = 1,158.60 × 387.56
  4. Step 4: Simplify right side
    772.40x = 449,027.02
  5. Step 5: Solve for x
    x = 449,027.02/772.40
  6. Step 6: Final answer
    x = 581.34

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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.