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Finding the Fourth Proportional to 549.18, 757.80 and 313.20

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Solution

The fourth proportional to 549.18, 757.80 and 313.20 is: 432.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.18 : 757.80 = 313.20 : x
  2. Step 2: Convert to fraction form
    549.18/757.80 = 313.20/x
  3. Step 3: Cross multiply
    549.18x = 757.80 × 313.20
  4. Step 4: Simplify right side
    549.18x = 237,342.96
  5. Step 5: Solve for x
    x = 237,342.96/549.18
  6. Step 6: Final answer
    x = 432.18

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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.