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Finding the Fourth Proportional to 261.51, 392.26 and 69.13

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Solution

The fourth proportional to 261.51, 392.26 and 69.13 is: 103.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.51 : 392.26 = 69.13 : x
  2. Step 2: Convert to fraction form
    261.51/392.26 = 69.13/x
  3. Step 3: Cross multiply
    261.51x = 392.26 × 69.13
  4. Step 4: Simplify right side
    261.51x = 27,116.93
  5. Step 5: Solve for x
    x = 27,116.93/261.51
  6. Step 6: Final answer
    x = 103.69

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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.