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Finding the Fourth Proportional to 638.91, 958.37 and 578.16

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Solution

The fourth proportional to 638.91, 958.37 and 578.16 is: 867.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.91 : 958.37 = 578.16 : x
  2. Step 2: Convert to fraction form
    638.91/958.37 = 578.16/x
  3. Step 3: Cross multiply
    638.91x = 958.37 × 578.16
  4. Step 4: Simplify right side
    638.91x = 554,091.20
  5. Step 5: Solve for x
    x = 554,091.20/638.91
  6. Step 6: Final answer
    x = 867.24

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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.