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Finding the Fourth Proportional to 543.10, 749.40 and 310.21

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Solution

The fourth proportional to 543.10, 749.40 and 310.21 is: 428.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.10 : 749.40 = 310.21 : x
  2. Step 2: Convert to fraction form
    543.10/749.40 = 310.21/x
  3. Step 3: Cross multiply
    543.10x = 749.40 × 310.21
  4. Step 4: Simplify right side
    543.10x = 232,471.37
  5. Step 5: Solve for x
    x = 232,471.37/543.10
  6. Step 6: Final answer
    x = 428.05

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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.