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Finding the Fourth Proportional to 388.66, 535.57 and 290.25

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Solution

The fourth proportional to 388.66, 535.57 and 290.25 is: 399.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.66 : 535.57 = 290.25 : x
  2. Step 2: Convert to fraction form
    388.66/535.57 = 290.25/x
  3. Step 3: Cross multiply
    388.66x = 535.57 × 290.25
  4. Step 4: Simplify right side
    388.66x = 155,449.19
  5. Step 5: Solve for x
    x = 155,449.19/388.66
  6. Step 6: Final answer
    x = 399.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.