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Finding the Fourth Proportional to 412.68, 619.02 and 138.72

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Solution

The fourth proportional to 412.68, 619.02 and 138.72 is: 208.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.68 : 619.02 = 138.72 : x
  2. Step 2: Convert to fraction form
    412.68/619.02 = 138.72/x
  3. Step 3: Cross multiply
    412.68x = 619.02 × 138.72
  4. Step 4: Simplify right side
    412.68x = 85,870.45
  5. Step 5: Solve for x
    x = 85,870.45/412.68
  6. Step 6: Final answer
    x = 208.08

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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.