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Finding the Fourth Proportional to 74.61, 112.59 and 73.80

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Solution

The fourth proportional to 74.61, 112.59 and 73.80 is: 111.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.61 : 112.59 = 73.80 : x
  2. Step 2: Convert to fraction form
    74.61/112.59 = 73.80/x
  3. Step 3: Cross multiply
    74.61x = 112.59 × 73.80
  4. Step 4: Simplify right side
    74.61x = 8,309.14
  5. Step 5: Solve for x
    x = 8,309.14/74.61
  6. Step 6: Final answer
    x = 111.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.