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Finding the Fourth Proportional to 693.12, 1,038.62 and 449.14

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Solution

The fourth proportional to 693.12, 1,038.62 and 449.14 is: 673.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.12 : 1,038.62 = 449.14 : x
  2. Step 2: Convert to fraction form
    693.12/1,038.62 = 449.14/x
  3. Step 3: Cross multiply
    693.12x = 1,038.62 × 449.14
  4. Step 4: Simplify right side
    693.12x = 466,485.79
  5. Step 5: Solve for x
    x = 466,485.79/693.12
  6. Step 6: Final answer
    x = 673.02

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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.