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Finding the Fourth Proportional to 261.40, 390.51 and 197.40

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Solution

The fourth proportional to 261.40, 390.51 and 197.40 is: 294.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.40 : 390.51 = 197.40 : x
  2. Step 2: Convert to fraction form
    261.40/390.51 = 197.40/x
  3. Step 3: Cross multiply
    261.40x = 390.51 × 197.40
  4. Step 4: Simplify right side
    261.40x = 77,086.67
  5. Step 5: Solve for x
    x = 77,086.67/261.40
  6. Step 6: Final answer
    x = 294.90

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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.