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Finding the Fourth Proportional to 246.88, 370.40 and 138.72

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Solution

The fourth proportional to 246.88, 370.40 and 138.72 is: 208.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    246.88 : 370.40 = 138.72 : x
  2. Step 2: Convert to fraction form
    246.88/370.40 = 138.72/x
  3. Step 3: Cross multiply
    246.88x = 370.40 × 138.72
  4. Step 4: Simplify right side
    246.88x = 51,381.89
  5. Step 5: Solve for x
    x = 51,381.89/246.88
  6. Step 6: Final answer
    x = 208.12

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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.