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Finding the Fourth Proportional to 261.51, 392.12 and 99.09

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Solution

The fourth proportional to 261.51, 392.12 and 99.09 is: 148.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.51 : 392.12 = 99.09 : x
  2. Step 2: Convert to fraction form
    261.51/392.12 = 99.09/x
  3. Step 3: Cross multiply
    261.51x = 392.12 × 99.09
  4. Step 4: Simplify right side
    261.51x = 38,854.68
  5. Step 5: Solve for x
    x = 38,854.68/261.51
  6. Step 6: Final answer
    x = 148.58

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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.