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Finding the Fourth Proportional to 70.36, 97.15 and 53.79

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Solution

The fourth proportional to 70.36, 97.15 and 53.79 is: 74.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.36 : 97.15 = 53.79 : x
  2. Step 2: Convert to fraction form
    70.36/97.15 = 53.79/x
  3. Step 3: Cross multiply
    70.36x = 97.15 × 53.79
  4. Step 4: Simplify right side
    70.36x = 5,225.43
  5. Step 5: Solve for x
    x = 5,225.43/70.36
  6. Step 6: Final answer
    x = 74.27

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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.