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Finding the Fourth Proportional to 117.90, 162.70 and 65.45

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Solution

The fourth proportional to 117.90, 162.70 and 65.45 is: 90.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.90 : 162.70 = 65.45 : x
  2. Step 2: Convert to fraction form
    117.90/162.70 = 65.45/x
  3. Step 3: Cross multiply
    117.90x = 162.70 × 65.45
  4. Step 4: Simplify right side
    117.90x = 10,648.72
  5. Step 5: Solve for x
    x = 10,648.72/117.90
  6. Step 6: Final answer
    x = 90.32

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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.