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Finding the Fourth Proportional to 117.84, 162.60 and 74.15

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Solution

The fourth proportional to 117.84, 162.60 and 74.15 is: 102.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.84 : 162.60 = 74.15 : x
  2. Step 2: Convert to fraction form
    117.84/162.60 = 74.15/x
  3. Step 3: Cross multiply
    117.84x = 162.60 × 74.15
  4. Step 4: Simplify right side
    117.84x = 12,056.57
  5. Step 5: Solve for x
    x = 12,056.57/117.84
  6. Step 6: Final answer
    x = 102.31

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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.