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Finding the Fourth Proportional to 963.42, 1,445.37 and 386.28

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Solution

The fourth proportional to 963.42, 1,445.37 and 386.28 is: 579.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.42 : 1,445.37 = 386.28 : x
  2. Step 2: Convert to fraction form
    963.42/1,445.37 = 386.28/x
  3. Step 3: Cross multiply
    963.42x = 1,445.37 × 386.28
  4. Step 4: Simplify right side
    963.42x = 558,317.52
  5. Step 5: Solve for x
    x = 558,317.52/963.42
  6. Step 6: Final answer
    x = 579.52

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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.