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Finding the Fourth Proportional to 652.43, 978.74 and 378.65

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Solution

The fourth proportional to 652.43, 978.74 and 378.65 is: 568.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.43 : 978.74 = 378.65 : x
  2. Step 2: Convert to fraction form
    652.43/978.74 = 378.65/x
  3. Step 3: Cross multiply
    652.43x = 978.74 × 378.65
  4. Step 4: Simplify right side
    652.43x = 370,601.87
  5. Step 5: Solve for x
    x = 370,601.87/652.43
  6. Step 6: Final answer
    x = 568.03

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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.