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Finding the Fourth Proportional to 388.32, 535.59 and 257.51

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Solution

The fourth proportional to 388.32, 535.59 and 257.51 is: 355.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.32 : 535.59 = 257.51 : x
  2. Step 2: Convert to fraction form
    388.32/535.59 = 257.51/x
  3. Step 3: Cross multiply
    388.32x = 535.59 × 257.51
  4. Step 4: Simplify right side
    388.32x = 137,917.10
  5. Step 5: Solve for x
    x = 137,917.10/388.32
  6. Step 6: Final answer
    x = 355.16

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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.