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Finding the Fourth Proportional to 850.17, 1,275.39 and 561

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Solution

The fourth proportional to 850.17, 1,275.39 and 561 is: 841.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.17 : 1,275.39 = 561 : x
  2. Step 2: Convert to fraction form
    850.17/1,275.39 = 561/x
  3. Step 3: Cross multiply
    850.17x = 1,275.39 × 561
  4. Step 4: Simplify right side
    850.17x = 715,493.79
  5. Step 5: Solve for x
    x = 715,493.79/850.17
  6. Step 6: Final answer
    x = 841.59

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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.