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Finding the Fourth Proportional to 963.60, 1,445.28 and 386.16

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Solution

The fourth proportional to 963.60, 1,445.28 and 386.16 is: 579.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.60 : 1,445.28 = 386.16 : x
  2. Step 2: Convert to fraction form
    963.60/1,445.28 = 386.16/x
  3. Step 3: Cross multiply
    963.60x = 1,445.28 × 386.16
  4. Step 4: Simplify right side
    963.60x = 558,109.32
  5. Step 5: Solve for x
    x = 558,109.32/963.60
  6. Step 6: Final answer
    x = 579.19

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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.