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Finding the Fourth Proportional to 963.48, 1,445.20 and 386.34

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Solution

The fourth proportional to 963.48, 1,445.20 and 386.34 is: 579.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.48 : 1,445.20 = 386.34 : x
  2. Step 2: Convert to fraction form
    963.48/1,445.20 = 386.34/x
  3. Step 3: Cross multiply
    963.48x = 1,445.20 × 386.34
  4. Step 4: Simplify right side
    963.48x = 558,338.57
  5. Step 5: Solve for x
    x = 558,338.57/963.48
  6. Step 6: Final answer
    x = 579.50

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Double scale
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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.