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Finding the Fourth Proportional to 852.55, 1,278.84 and 561.92

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Solution

The fourth proportional to 852.55, 1,278.84 and 561.92 is: 842.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.55 : 1,278.84 = 561.92 : x
  2. Step 2: Convert to fraction form
    852.55/1,278.84 = 561.92/x
  3. Step 3: Cross multiply
    852.55x = 1,278.84 × 561.92
  4. Step 4: Simplify right side
    852.55x = 718,599.38
  5. Step 5: Solve for x
    x = 718,599.38/852.55
  6. Step 6: Final answer
    x = 842.88

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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.