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Finding the Fourth Proportional to 715.89, 988.35 and 549.78

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Solution

The fourth proportional to 715.89, 988.35 and 549.78 is: 759.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.89 : 988.35 = 549.78 : x
  2. Step 2: Convert to fraction form
    715.89/988.35 = 549.78/x
  3. Step 3: Cross multiply
    715.89x = 988.35 × 549.78
  4. Step 4: Simplify right side
    715.89x = 543,375.06
  5. Step 5: Solve for x
    x = 543,375.06/715.89
  6. Step 6: Final answer
    x = 759.02

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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.