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Finding the Fourth Proportional to 291.60, 402.84 and 248.40

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Solution

The fourth proportional to 291.60, 402.84 and 248.40 is: 343.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.60 : 402.84 = 248.40 : x
  2. Step 2: Convert to fraction form
    291.60/402.84 = 248.40/x
  3. Step 3: Cross multiply
    291.60x = 402.84 × 248.40
  4. Step 4: Simplify right side
    291.60x = 100,065.46
  5. Step 5: Solve for x
    x = 100,065.46/291.60
  6. Step 6: Final answer
    x = 343.16

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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.