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Finding the Fourth Proportional to 964.40, 1,445.40 and 748.16

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Solution

The fourth proportional to 964.40, 1,445.40 and 748.16 is: 1,121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.40 : 1,445.40 = 748.16 : x
  2. Step 2: Convert to fraction form
    964.40/1,445.40 = 748.16/x
  3. Step 3: Cross multiply
    964.40x = 1,445.40 × 748.16
  4. Step 4: Simplify right side
    964.40x = 1,081,390.46
  5. Step 5: Solve for x
    x = 1,081,390.46/964.40
  6. Step 6: Final answer
    x = 1,121.31

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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.