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Finding the Fourth Proportional to 852.58, 1,278.87 and 578.94

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Solution

The fourth proportional to 852.58, 1,278.87 and 578.94 is: 868.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.58 : 1,278.87 = 578.94 : x
  2. Step 2: Convert to fraction form
    852.58/1,278.87 = 578.94/x
  3. Step 3: Cross multiply
    852.58x = 1,278.87 × 578.94
  4. Step 4: Simplify right side
    852.58x = 740,389.00
  5. Step 5: Solve for x
    x = 740,389.00/852.58
  6. Step 6: Final answer
    x = 868.41

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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.