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Finding the Fourth Proportional to 964.90, 1,447.32 and 315.62

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Solution

The fourth proportional to 964.90, 1,447.32 and 315.62 is: 473.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.90 : 1,447.32 = 315.62 : x
  2. Step 2: Convert to fraction form
    964.90/1,447.32 = 315.62/x
  3. Step 3: Cross multiply
    964.90x = 1,447.32 × 315.62
  4. Step 4: Simplify right side
    964.90x = 456,803.14
  5. Step 5: Solve for x
    x = 456,803.14/964.90
  6. Step 6: Final answer
    x = 473.42

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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.