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Finding the Fourth Proportional to 256.98, 387.35 and 235.07

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Solution

The fourth proportional to 256.98, 387.35 and 235.07 is: 354.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.98 : 387.35 = 235.07 : x
  2. Step 2: Convert to fraction form
    256.98/387.35 = 235.07/x
  3. Step 3: Cross multiply
    256.98x = 387.35 × 235.07
  4. Step 4: Simplify right side
    256.98x = 91,054.36
  5. Step 5: Solve for x
    x = 91,054.36/256.98
  6. Step 6: Final answer
    x = 354.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.