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Finding the Fourth Proportional to 74.22, 102.30 and 55.86

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Solution

The fourth proportional to 74.22, 102.30 and 55.86 is: 76.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.22 : 102.30 = 55.86 : x
  2. Step 2: Convert to fraction form
    74.22/102.30 = 55.86/x
  3. Step 3: Cross multiply
    74.22x = 102.30 × 55.86
  4. Step 4: Simplify right side
    74.22x = 5,714.48
  5. Step 5: Solve for x
    x = 5,714.48/74.22
  6. Step 6: Final answer
    x = 76.99

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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.