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Finding the Fourth Proportional to 257.79, 355.77 and 152.91

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Solution

The fourth proportional to 257.79, 355.77 and 152.91 is: 211.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.79 : 355.77 = 152.91 : x
  2. Step 2: Convert to fraction form
    257.79/355.77 = 152.91/x
  3. Step 3: Cross multiply
    257.79x = 355.77 × 152.91
  4. Step 4: Simplify right side
    257.79x = 54,400.79
  5. Step 5: Solve for x
    x = 54,400.79/257.79
  6. Step 6: Final answer
    x = 211.03

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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.