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Finding the Fourth Proportional to 652.56, 979.20 and 287.36

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Solution

The fourth proportional to 652.56, 979.20 and 287.36 is: 431.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.56 : 979.20 = 287.36 : x
  2. Step 2: Convert to fraction form
    652.56/979.20 = 287.36/x
  3. Step 3: Cross multiply
    652.56x = 979.20 × 287.36
  4. Step 4: Simplify right side
    652.56x = 281,382.91
  5. Step 5: Solve for x
    x = 281,382.91/652.56
  6. Step 6: Final answer
    x = 431.20

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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.