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Finding the Fourth Proportional to 852.76, 1,278.78 and 528.76

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Solution

The fourth proportional to 852.76, 1,278.78 and 528.76 is: 792.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.76 : 1,278.78 = 528.76 : x
  2. Step 2: Convert to fraction form
    852.76/1,278.78 = 528.76/x
  3. Step 3: Cross multiply
    852.76x = 1,278.78 × 528.76
  4. Step 4: Simplify right side
    852.76x = 676,167.71
  5. Step 5: Solve for x
    x = 676,167.71/852.76
  6. Step 6: Final answer
    x = 792.92

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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.