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Finding the Fourth Proportional to 72.40, 100.54 and 72.08

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Solution

The fourth proportional to 72.40, 100.54 and 72.08 is: 100.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.40 : 100.54 = 72.08 : x
  2. Step 2: Convert to fraction form
    72.40/100.54 = 72.08/x
  3. Step 3: Cross multiply
    72.40x = 100.54 × 72.08
  4. Step 4: Simplify right side
    72.40x = 7,246.92
  5. Step 5: Solve for x
    x = 7,246.92/72.40
  6. Step 6: Final answer
    x = 100.10

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.