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Finding the Fourth Proportional to 74.08, 102.34 and 55.72

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Solution

The fourth proportional to 74.08, 102.34 and 55.72 is: 76.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.08 : 102.34 = 55.72 : x
  2. Step 2: Convert to fraction form
    74.08/102.34 = 55.72/x
  3. Step 3: Cross multiply
    74.08x = 102.34 × 55.72
  4. Step 4: Simplify right side
    74.08x = 5,702.38
  5. Step 5: Solve for x
    x = 5,702.38/74.08
  6. Step 6: Final answer
    x = 76.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.