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Finding the Fourth Proportional to 734.40, 1,098.90 and 491.40

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Solution

The fourth proportional to 734.40, 1,098.90 and 491.40 is: 735.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    734.40 : 1,098.90 = 491.40 : x
  2. Step 2: Convert to fraction form
    734.40/1,098.90 = 491.40/x
  3. Step 3: Cross multiply
    734.40x = 1,098.90 × 491.40
  4. Step 4: Simplify right side
    734.40x = 539,999.46
  5. Step 5: Solve for x
    x = 539,999.46/734.40
  6. Step 6: Final answer
    x = 735.29

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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.