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Finding the Fourth Proportional to 257.19, 354.99 and 152.30

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Solution

The fourth proportional to 257.19, 354.99 and 152.30 is: 210.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.19 : 354.99 = 152.30 : x
  2. Step 2: Convert to fraction form
    257.19/354.99 = 152.30/x
  3. Step 3: Cross multiply
    257.19x = 354.99 × 152.30
  4. Step 4: Simplify right side
    257.19x = 54,063.20
  5. Step 5: Solve for x
    x = 54,063.20/257.19
  6. Step 6: Final answer
    x = 210.21

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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.