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Finding the Fourth Proportional to 543.90, 749.70 and 438.72

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Solution

The fourth proportional to 543.90, 749.70 and 438.72 is: 604.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.90 : 749.70 = 438.72 : x
  2. Step 2: Convert to fraction form
    543.90/749.70 = 438.72/x
  3. Step 3: Cross multiply
    543.90x = 749.70 × 438.72
  4. Step 4: Simplify right side
    543.90x = 328,908.38
  5. Step 5: Solve for x
    x = 328,908.38/543.90
  6. Step 6: Final answer
    x = 604.72

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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.