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Finding the Fourth Proportional to 86.03, 118.65 and 70.47

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Solution

The fourth proportional to 86.03, 118.65 and 70.47 is: 97.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.03 : 118.65 = 70.47 : x
  2. Step 2: Convert to fraction form
    86.03/118.65 = 70.47/x
  3. Step 3: Cross multiply
    86.03x = 118.65 × 70.47
  4. Step 4: Simplify right side
    86.03x = 8,361.27
  5. Step 5: Solve for x
    x = 8,361.27/86.03
  6. Step 6: Final answer
    x = 97.20

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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.