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Finding the Fourth Proportional to 291.29, 436.93 and 74.87

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Solution

The fourth proportional to 291.29, 436.93 and 74.87 is: 112.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.29 : 436.93 = 74.87 : x
  2. Step 2: Convert to fraction form
    291.29/436.93 = 74.87/x
  3. Step 3: Cross multiply
    291.29x = 436.93 × 74.87
  4. Step 4: Simplify right side
    291.29x = 32,712.95
  5. Step 5: Solve for x
    x = 32,712.95/291.29
  6. Step 6: Final answer
    x = 112.30

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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.