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Finding the Fourth Proportional to 100.91, 139.27 and 64.06

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Solution

The fourth proportional to 100.91, 139.27 and 64.06 is: 88.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.91 : 139.27 = 64.06 : x
  2. Step 2: Convert to fraction form
    100.91/139.27 = 64.06/x
  3. Step 3: Cross multiply
    100.91x = 139.27 × 64.06
  4. Step 4: Simplify right side
    100.91x = 8,921.64
  5. Step 5: Solve for x
    x = 8,921.64/100.91
  6. Step 6: Final answer
    x = 88.41

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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.