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Finding the Fourth Proportional to 74.25, 102.45 and 43.16

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Solution

The fourth proportional to 74.25, 102.45 and 43.16 is: 59.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.25 : 102.45 = 43.16 : x
  2. Step 2: Convert to fraction form
    74.25/102.45 = 43.16/x
  3. Step 3: Cross multiply
    74.25x = 102.45 × 43.16
  4. Step 4: Simplify right side
    74.25x = 4,421.74
  5. Step 5: Solve for x
    x = 4,421.74/74.25
  6. Step 6: Final answer
    x = 59.55

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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.