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Finding the Fourth Proportional to 852.92, 1,277.12 and 687.48

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Solution

The fourth proportional to 852.92, 1,277.12 and 687.48 is: 1,029.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.92 : 1,277.12 = 687.48 : x
  2. Step 2: Convert to fraction form
    852.92/1,277.12 = 687.48/x
  3. Step 3: Cross multiply
    852.92x = 1,277.12 × 687.48
  4. Step 4: Simplify right side
    852.92x = 877,994.46
  5. Step 5: Solve for x
    x = 877,994.46/852.92
  6. Step 6: Final answer
    x = 1,029.40

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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.