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Finding the Fourth Proportional to 718.89, 1,077.40 and 353.78

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Solution

The fourth proportional to 718.89, 1,077.40 and 353.78 is: 530.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.89 : 1,077.40 = 353.78 : x
  2. Step 2: Convert to fraction form
    718.89/1,077.40 = 353.78/x
  3. Step 3: Cross multiply
    718.89x = 1,077.40 × 353.78
  4. Step 4: Simplify right side
    718.89x = 381,162.57
  5. Step 5: Solve for x
    x = 381,162.57/718.89
  6. Step 6: Final answer
    x = 530.21

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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.