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Finding the Fourth Proportional to 261.08, 392.04 and 215.33

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Solution

The fourth proportional to 261.08, 392.04 and 215.33 is: 323.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.08 : 392.04 = 215.33 : x
  2. Step 2: Convert to fraction form
    261.08/392.04 = 215.33/x
  3. Step 3: Cross multiply
    261.08x = 392.04 × 215.33
  4. Step 4: Simplify right side
    261.08x = 84,417.97
  5. Step 5: Solve for x
    x = 84,417.97/261.08
  6. Step 6: Final answer
    x = 323.34

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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.