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Finding the Fourth Proportional to 117.78, 162.54 and 64.61

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Solution

The fourth proportional to 117.78, 162.54 and 64.61 is: 89.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.78 : 162.54 = 64.61 : x
  2. Step 2: Convert to fraction form
    117.78/162.54 = 64.61/x
  3. Step 3: Cross multiply
    117.78x = 162.54 × 64.61
  4. Step 4: Simplify right side
    117.78x = 10,502.12
  5. Step 5: Solve for x
    x = 10,502.12/117.78
  6. Step 6: Final answer
    x = 89.17

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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.