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Finding the Fourth Proportional to 961.50, 1,442.34 and 312.06

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Solution

The fourth proportional to 961.50, 1,442.34 and 312.06 is: 468.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.50 : 1,442.34 = 312.06 : x
  2. Step 2: Convert to fraction form
    961.50/1,442.34 = 312.06/x
  3. Step 3: Cross multiply
    961.50x = 1,442.34 × 312.06
  4. Step 4: Simplify right side
    961.50x = 450,096.62
  5. Step 5: Solve for x
    x = 450,096.62/961.50
  6. Step 6: Final answer
    x = 468.12

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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.