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Finding the Fourth Proportional to 961.53, 1,442.31 and 303.40

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Solution

The fourth proportional to 961.53, 1,442.31 and 303.40 is: 455.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.53 : 1,442.31 = 303.40 : x
  2. Step 2: Convert to fraction form
    961.53/1,442.31 = 303.40/x
  3. Step 3: Cross multiply
    961.53x = 1,442.31 × 303.40
  4. Step 4: Simplify right side
    961.53x = 437,591.11
  5. Step 5: Solve for x
    x = 437,591.11/961.53
  6. Step 6: Final answer
    x = 455.10

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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.