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Finding the Fourth Proportional to 74.61, 111.78 and 73.35

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Solution

The fourth proportional to 74.61, 111.78 and 73.35 is: 109.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.61 : 111.78 = 73.35 : x
  2. Step 2: Convert to fraction form
    74.61/111.78 = 73.35/x
  3. Step 3: Cross multiply
    74.61x = 111.78 × 73.35
  4. Step 4: Simplify right side
    74.61x = 8,199.06
  5. Step 5: Solve for x
    x = 8,199.06/74.61
  6. Step 6: Final answer
    x = 109.89

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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.