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Finding the Fourth Proportional to 291.95, 438.12 and 147.77

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Solution

The fourth proportional to 291.95, 438.12 and 147.77 is: 221.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.95 : 438.12 = 147.77 : x
  2. Step 2: Convert to fraction form
    291.95/438.12 = 147.77/x
  3. Step 3: Cross multiply
    291.95x = 438.12 × 147.77
  4. Step 4: Simplify right side
    291.95x = 64,738.80
  5. Step 5: Solve for x
    x = 64,738.80/291.95
  6. Step 6: Final answer
    x = 221.75

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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.