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Finding the Fourth Proportional to 261.54, 390.80 and 199.50

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Solution

The fourth proportional to 261.54, 390.80 and 199.50 is: 298.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.54 : 390.80 = 199.50 : x
  2. Step 2: Convert to fraction form
    261.54/390.80 = 199.50/x
  3. Step 3: Cross multiply
    261.54x = 390.80 × 199.50
  4. Step 4: Simplify right side
    261.54x = 77,964.60
  5. Step 5: Solve for x
    x = 77,964.60/261.54
  6. Step 6: Final answer
    x = 298.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.