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Finding the Fourth Proportional to 108.84, 162.98 and 86.06

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Solution

The fourth proportional to 108.84, 162.98 and 86.06 is: 128.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.84 : 162.98 = 86.06 : x
  2. Step 2: Convert to fraction form
    108.84/162.98 = 86.06/x
  3. Step 3: Cross multiply
    108.84x = 162.98 × 86.06
  4. Step 4: Simplify right side
    108.84x = 14,024.81
  5. Step 5: Solve for x
    x = 14,024.81/108.84
  6. Step 6: Final answer
    x = 128.86

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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.