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Finding the Fourth Proportional to 117.10, 161.65 and 77.22

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Solution

The fourth proportional to 117.10, 161.65 and 77.22 is: 106.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.10 : 161.65 = 77.22 : x
  2. Step 2: Convert to fraction form
    117.10/161.65 = 77.22/x
  3. Step 3: Cross multiply
    117.10x = 161.65 × 77.22
  4. Step 4: Simplify right side
    117.10x = 12,482.61
  5. Step 5: Solve for x
    x = 12,482.61/117.10
  6. Step 6: Final answer
    x = 106.60

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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.