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Finding the Fourth Proportional to 261.07, 360.15 and 156.09

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Solution

The fourth proportional to 261.07, 360.15 and 156.09 is: 215.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.07 : 360.15 = 156.09 : x
  2. Step 2: Convert to fraction form
    261.07/360.15 = 156.09/x
  3. Step 3: Cross multiply
    261.07x = 360.15 × 156.09
  4. Step 4: Simplify right side
    261.07x = 56,215.81
  5. Step 5: Solve for x
    x = 56,215.81/261.07
  6. Step 6: Final answer
    x = 215.33

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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.