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Finding the Fourth Proportional to 70.84, 97.77 and 43.21

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Solution

The fourth proportional to 70.84, 97.77 and 43.21 is: 59.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.84 : 97.77 = 43.21 : x
  2. Step 2: Convert to fraction form
    70.84/97.77 = 43.21/x
  3. Step 3: Cross multiply
    70.84x = 97.77 × 43.21
  4. Step 4: Simplify right side
    70.84x = 4,224.93
  5. Step 5: Solve for x
    x = 4,224.93/70.84
  6. Step 6: Final answer
    x = 59.64

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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.