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Finding the Fourth Proportional to 261.69, 392.55 and 90.69

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Solution

The fourth proportional to 261.69, 392.55 and 90.69 is: 136.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.69 : 392.55 = 90.69 : x
  2. Step 2: Convert to fraction form
    261.69/392.55 = 90.69/x
  3. Step 3: Cross multiply
    261.69x = 392.55 × 90.69
  4. Step 4: Simplify right side
    261.69x = 35,599.91
  5. Step 5: Solve for x
    x = 35,599.91/261.69
  6. Step 6: Final answer
    x = 136.04

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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.