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Finding the Fourth Proportional to 261.63, 391.50 and 153.09

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Solution

The fourth proportional to 261.63, 391.50 and 153.09 is: 229.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.63 : 391.50 = 153.09 : x
  2. Step 2: Convert to fraction form
    261.63/391.50 = 153.09/x
  3. Step 3: Cross multiply
    261.63x = 391.50 × 153.09
  4. Step 4: Simplify right side
    261.63x = 59,934.74
  5. Step 5: Solve for x
    x = 59,934.74/261.63
  6. Step 6: Final answer
    x = 229.08

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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.