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Finding the Fourth Proportional to 929.12, 1,393.68 and 441.60

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Solution

The fourth proportional to 929.12, 1,393.68 and 441.60 is: 662.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.12 : 1,393.68 = 441.60 : x
  2. Step 2: Convert to fraction form
    929.12/1,393.68 = 441.60/x
  3. Step 3: Cross multiply
    929.12x = 1,393.68 × 441.60
  4. Step 4: Simplify right side
    929.12x = 615,449.09
  5. Step 5: Solve for x
    x = 615,449.09/929.12
  6. Step 6: Final answer
    x = 662.40

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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.