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Finding the Fourth Proportional to 261.51, 392.21 and 99.16

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Solution

The fourth proportional to 261.51, 392.21 and 99.16 is: 148.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.51 : 392.21 = 99.16 : x
  2. Step 2: Convert to fraction form
    261.51/392.21 = 99.16/x
  3. Step 3: Cross multiply
    261.51x = 392.21 × 99.16
  4. Step 4: Simplify right side
    261.51x = 38,891.54
  5. Step 5: Solve for x
    x = 38,891.54/261.51
  6. Step 6: Final answer
    x = 148.72

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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.