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Finding the Fourth Proportional to 291.16, 436.29 and 260.56

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Solution

The fourth proportional to 291.16, 436.29 and 260.56 is: 390.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.16 : 436.29 = 260.56 : x
  2. Step 2: Convert to fraction form
    291.16/436.29 = 260.56/x
  3. Step 3: Cross multiply
    291.16x = 436.29 × 260.56
  4. Step 4: Simplify right side
    291.16x = 113,679.72
  5. Step 5: Solve for x
    x = 113,679.72/291.16
  6. Step 6: Final answer
    x = 390.44

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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.