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Finding the Fourth Proportional to 964.19, 1,447.65 and 920.15

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Solution

The fourth proportional to 964.19, 1,447.65 and 920.15 is: 1,381.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.19 : 1,447.65 = 920.15 : x
  2. Step 2: Convert to fraction form
    964.19/1,447.65 = 920.15/x
  3. Step 3: Cross multiply
    964.19x = 1,447.65 × 920.15
  4. Step 4: Simplify right side
    964.19x = 1,332,047.91
  5. Step 5: Solve for x
    x = 1,332,047.91/964.19
  6. Step 6: Final answer
    x = 1,381.53

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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.