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Finding the Fourth Proportional to 159.30, 239 and 72.65

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Solution

The fourth proportional to 159.30, 239 and 72.65 is: 109.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.30 : 239 = 72.65 : x
  2. Step 2: Convert to fraction form
    159.30/239 = 72.65/x
  3. Step 3: Cross multiply
    159.30x = 239 × 72.65
  4. Step 4: Simplify right side
    159.30x = 17,363.35
  5. Step 5: Solve for x
    x = 17,363.35/159.30
  6. Step 6: Final answer
    x = 109.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.