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Finding the Fourth Proportional to 261.39, 360.81 and 206.25

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Solution

The fourth proportional to 261.39, 360.81 and 206.25 is: 284.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.39 : 360.81 = 206.25 : x
  2. Step 2: Convert to fraction form
    261.39/360.81 = 206.25/x
  3. Step 3: Cross multiply
    261.39x = 360.81 × 206.25
  4. Step 4: Simplify right side
    261.39x = 74,417.06
  5. Step 5: Solve for x
    x = 74,417.06/261.39
  6. Step 6: Final answer
    x = 284.70

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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.