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Finding the Fourth Proportional to 86.06, 129.18 and 70.22

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Solution

The fourth proportional to 86.06, 129.18 and 70.22 is: 105.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.06 : 129.18 = 70.22 : x
  2. Step 2: Convert to fraction form
    86.06/129.18 = 70.22/x
  3. Step 3: Cross multiply
    86.06x = 129.18 × 70.22
  4. Step 4: Simplify right side
    86.06x = 9,071.02
  5. Step 5: Solve for x
    x = 9,071.02/86.06
  6. Step 6: Final answer
    x = 105.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.