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Finding the Fourth Proportional to 872.69, 1,308.62 and 543.62

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Solution

The fourth proportional to 872.69, 1,308.62 and 543.62 is: 815.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.69 : 1,308.62 = 543.62 : x
  2. Step 2: Convert to fraction form
    872.69/1,308.62 = 543.62/x
  3. Step 3: Cross multiply
    872.69x = 1,308.62 × 543.62
  4. Step 4: Simplify right side
    872.69x = 711,382.74
  5. Step 5: Solve for x
    x = 711,382.74/872.69
  6. Step 6: Final answer
    x = 815.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.