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Finding the Fourth Proportional to 291.40, 402.12 and 186.36

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Solution

The fourth proportional to 291.40, 402.12 and 186.36 is: 257.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.40 : 402.12 = 186.36 : x
  2. Step 2: Convert to fraction form
    291.40/402.12 = 186.36/x
  3. Step 3: Cross multiply
    291.40x = 402.12 × 186.36
  4. Step 4: Simplify right side
    291.40x = 74,939.08
  5. Step 5: Solve for x
    x = 74,939.08/291.40
  6. Step 6: Final answer
    x = 257.17

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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.