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Finding the Fourth Proportional to 261.07, 360.25 and 156.15

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Solution

The fourth proportional to 261.07, 360.25 and 156.15 is: 215.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.07 : 360.25 = 156.15 : x
  2. Step 2: Convert to fraction form
    261.07/360.25 = 156.15/x
  3. Step 3: Cross multiply
    261.07x = 360.25 × 156.15
  4. Step 4: Simplify right side
    261.07x = 56,253.66
  5. Step 5: Solve for x
    x = 56,253.66/261.07
  6. Step 6: Final answer
    x = 215.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.