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Finding the Fourth Proportional to 117.91, 162.70 and 71.30

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Solution

The fourth proportional to 117.91, 162.70 and 71.30 is: 98.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.91 : 162.70 = 71.30 : x
  2. Step 2: Convert to fraction form
    117.91/162.70 = 71.30/x
  3. Step 3: Cross multiply
    117.91x = 162.70 × 71.30
  4. Step 4: Simplify right side
    117.91x = 11,600.51
  5. Step 5: Solve for x
    x = 11,600.51/117.91
  6. Step 6: Final answer
    x = 98.38

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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.