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Finding the Fourth Proportional to 291.80, 436.80 and 259.40

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Solution

The fourth proportional to 291.80, 436.80 and 259.40 is: 388.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.80 : 436.80 = 259.40 : x
  2. Step 2: Convert to fraction form
    291.80/436.80 = 259.40/x
  3. Step 3: Cross multiply
    291.80x = 436.80 × 259.40
  4. Step 4: Simplify right side
    291.80x = 113,305.92
  5. Step 5: Solve for x
    x = 113,305.92/291.80
  6. Step 6: Final answer
    x = 388.30

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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.