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Finding the Fourth Proportional to 961.74, 1,442.88 and 385.02

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Solution

The fourth proportional to 961.74, 1,442.88 and 385.02 is: 577.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.74 : 1,442.88 = 385.02 : x
  2. Step 2: Convert to fraction form
    961.74/1,442.88 = 385.02/x
  3. Step 3: Cross multiply
    961.74x = 1,442.88 × 385.02
  4. Step 4: Simplify right side
    961.74x = 555,537.66
  5. Step 5: Solve for x
    x = 555,537.66/961.74
  6. Step 6: Final answer
    x = 577.64

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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.