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Finding the Fourth Proportional to 717.25, 1,076.28 and 388.19

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Solution

The fourth proportional to 717.25, 1,076.28 and 388.19 is: 582.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.25 : 1,076.28 = 388.19 : x
  2. Step 2: Convert to fraction form
    717.25/1,076.28 = 388.19/x
  3. Step 3: Cross multiply
    717.25x = 1,076.28 × 388.19
  4. Step 4: Simplify right side
    717.25x = 417,801.13
  5. Step 5: Solve for x
    x = 417,801.13/717.25
  6. Step 6: Final answer
    x = 582.50

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Double scale
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1.5x scale

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.