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Finding the Fourth Proportional to 489.40, 734.10 and 475.90

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Solution

The fourth proportional to 489.40, 734.10 and 475.90 is: 713.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.40 : 734.10 = 475.90 : x
  2. Step 2: Convert to fraction form
    489.40/734.10 = 475.90/x
  3. Step 3: Cross multiply
    489.40x = 734.10 × 475.90
  4. Step 4: Simplify right side
    489.40x = 349,358.19
  5. Step 5: Solve for x
    x = 349,358.19/489.40
  6. Step 6: Final answer
    x = 713.85

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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.