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Finding the Fourth Proportional to 729.16, 1,005.62 and 449.40

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Solution

The fourth proportional to 729.16, 1,005.62 and 449.40 is: 619.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.16 : 1,005.62 = 449.40 : x
  2. Step 2: Convert to fraction form
    729.16/1,005.62 = 449.40/x
  3. Step 3: Cross multiply
    729.16x = 1,005.62 × 449.40
  4. Step 4: Simplify right side
    729.16x = 451,925.63
  5. Step 5: Solve for x
    x = 451,925.63/729.16
  6. Step 6: Final answer
    x = 619.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.