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Finding the Fourth Proportional to 713.28, 1,070.25 and 388.26

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Solution

The fourth proportional to 713.28, 1,070.25 and 388.26 is: 582.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.28 : 1,070.25 = 388.26 : x
  2. Step 2: Convert to fraction form
    713.28/1,070.25 = 388.26/x
  3. Step 3: Cross multiply
    713.28x = 1,070.25 × 388.26
  4. Step 4: Simplify right side
    713.28x = 415,535.27
  5. Step 5: Solve for x
    x = 415,535.27/713.28
  6. Step 6: Final answer
    x = 582.57

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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.