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Finding the Fourth Proportional to 261.15, 360.36 and 156.21

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Solution

The fourth proportional to 261.15, 360.36 and 156.21 is: 215.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.15 : 360.36 = 156.21 : x
  2. Step 2: Convert to fraction form
    261.15/360.36 = 156.21/x
  3. Step 3: Cross multiply
    261.15x = 360.36 × 156.21
  4. Step 4: Simplify right side
    261.15x = 56,291.84
  5. Step 5: Solve for x
    x = 56,291.84/261.15
  6. Step 6: Final answer
    x = 215.55

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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.