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Finding the Fourth Proportional to 772.08, 1,158.40 and 361.60

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Solution

The fourth proportional to 772.08, 1,158.40 and 361.60 is: 542.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.08 : 1,158.40 = 361.60 : x
  2. Step 2: Convert to fraction form
    772.08/1,158.40 = 361.60/x
  3. Step 3: Cross multiply
    772.08x = 1,158.40 × 361.60
  4. Step 4: Simplify right side
    772.08x = 418,877.44
  5. Step 5: Solve for x
    x = 418,877.44/772.08
  6. Step 6: Final answer
    x = 542.53

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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.