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Finding the Fourth Proportional to 964.72, 1,447.20 and 315.68

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Solution

The fourth proportional to 964.72, 1,447.20 and 315.68 is: 473.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.72 : 1,447.20 = 315.68 : x
  2. Step 2: Convert to fraction form
    964.72/1,447.20 = 315.68/x
  3. Step 3: Cross multiply
    964.72x = 1,447.20 × 315.68
  4. Step 4: Simplify right side
    964.72x = 456,852.10
  5. Step 5: Solve for x
    x = 456,852.10/964.72
  6. Step 6: Final answer
    x = 473.56

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.