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Finding the Fourth Proportional to 874.81, 1,207.80 and 543.72

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Solution

The fourth proportional to 874.81, 1,207.80 and 543.72 is: 750.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.81 : 1,207.80 = 543.72 : x
  2. Step 2: Convert to fraction form
    874.81/1,207.80 = 543.72/x
  3. Step 3: Cross multiply
    874.81x = 1,207.80 × 543.72
  4. Step 4: Simplify right side
    874.81x = 656,698.98
  5. Step 5: Solve for x
    x = 656,698.98/874.81
  6. Step 6: Final answer
    x = 750.68

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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.