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Finding the Fourth Proportional to 261.29, 390.02 and 242.72

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Solution

The fourth proportional to 261.29, 390.02 and 242.72 is: 362.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.29 : 390.02 = 242.72 : x
  2. Step 2: Convert to fraction form
    261.29/390.02 = 242.72/x
  3. Step 3: Cross multiply
    261.29x = 390.02 × 242.72
  4. Step 4: Simplify right side
    261.29x = 94,662.49
  5. Step 5: Solve for x
    x = 94,662.49/261.29
  6. Step 6: Final answer
    x = 362.30

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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.