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Finding the Fourth Proportional to 742.79, 1,025.46 and 494.45

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Solution

The fourth proportional to 742.79, 1,025.46 and 494.45 is: 682.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.79 : 1,025.46 = 494.45 : x
  2. Step 2: Convert to fraction form
    742.79/1,025.46 = 494.45/x
  3. Step 3: Cross multiply
    742.79x = 1,025.46 × 494.45
  4. Step 4: Simplify right side
    742.79x = 507,038.70
  5. Step 5: Solve for x
    x = 507,038.70/742.79
  6. Step 6: Final answer
    x = 682.61

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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.