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Finding the Fourth Proportional to 652.24, 978.81 and 287.11

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Solution

The fourth proportional to 652.24, 978.81 and 287.11 is: 430.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.24 : 978.81 = 287.11 : x
  2. Step 2: Convert to fraction form
    652.24/978.81 = 287.11/x
  3. Step 3: Cross multiply
    652.24x = 978.81 × 287.11
  4. Step 4: Simplify right side
    652.24x = 281,026.14
  5. Step 5: Solve for x
    x = 281,026.14/652.24
  6. Step 6: Final answer
    x = 430.86

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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.