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Finding the Fourth Proportional to 261.94, 392.92 and 90.94

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Solution

The fourth proportional to 261.94, 392.92 and 90.94 is: 136.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.94 : 392.92 = 90.94 : x
  2. Step 2: Convert to fraction form
    261.94/392.92 = 90.94/x
  3. Step 3: Cross multiply
    261.94x = 392.92 × 90.94
  4. Step 4: Simplify right side
    261.94x = 35,730.94
  5. Step 5: Solve for x
    x = 35,730.94/261.94
  6. Step 6: Final answer
    x = 136.41

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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.