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Finding the Fourth Proportional to 291.96, 438.03 and 99.59

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Solution

The fourth proportional to 291.96, 438.03 and 99.59 is: 149.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.96 : 438.03 = 99.59 : x
  2. Step 2: Convert to fraction form
    291.96/438.03 = 99.59/x
  3. Step 3: Cross multiply
    291.96x = 438.03 × 99.59
  4. Step 4: Simplify right side
    291.96x = 43,621.22
  5. Step 5: Solve for x
    x = 43,621.22/291.96
  6. Step 6: Final answer
    x = 149.41

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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.