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Finding the Fourth Proportional to 852.20, 1,176.70 and 687.20

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Solution

The fourth proportional to 852.20, 1,176.70 and 687.20 is: 948.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.20 : 1,176.70 = 687.20 : x
  2. Step 2: Convert to fraction form
    852.20/1,176.70 = 687.20/x
  3. Step 3: Cross multiply
    852.20x = 1,176.70 × 687.20
  4. Step 4: Simplify right side
    852.20x = 808,628.24
  5. Step 5: Solve for x
    x = 808,628.24/852.20
  6. Step 6: Final answer
    x = 948.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.