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Finding the Fourth Proportional to 291.70, 402.39 and 192.12

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Solution

The fourth proportional to 291.70, 402.39 and 192.12 is: 265.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.70 : 402.39 = 192.12 : x
  2. Step 2: Convert to fraction form
    291.70/402.39 = 192.12/x
  3. Step 3: Cross multiply
    291.70x = 402.39 × 192.12
  4. Step 4: Simplify right side
    291.70x = 77,307.17
  5. Step 5: Solve for x
    x = 77,307.17/291.70
  6. Step 6: Final answer
    x = 265.02

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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.