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Finding the Fourth Proportional to 261.21, 392.01 and 245.07

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Solution

The fourth proportional to 261.21, 392.01 and 245.07 is: 367.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.21 : 392.01 = 245.07 : x
  2. Step 2: Convert to fraction form
    261.21/392.01 = 245.07/x
  3. Step 3: Cross multiply
    261.21x = 392.01 × 245.07
  4. Step 4: Simplify right side
    261.21x = 96,069.89
  5. Step 5: Solve for x
    x = 96,069.89/261.21
  6. Step 6: Final answer
    x = 367.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.