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Finding the Fourth Proportional to 962.12, 1,443.04 and 312.78

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Solution

The fourth proportional to 962.12, 1,443.04 and 312.78 is: 469.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.12 : 1,443.04 = 312.78 : x
  2. Step 2: Convert to fraction form
    962.12/1,443.04 = 312.78/x
  3. Step 3: Cross multiply
    962.12x = 1,443.04 × 312.78
  4. Step 4: Simplify right side
    962.12x = 451,354.05
  5. Step 5: Solve for x
    x = 451,354.05/962.12
  6. Step 6: Final answer
    x = 469.12

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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.