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Finding the Fourth Proportional to 72.70, 100.23 and 56.26

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Solution

The fourth proportional to 72.70, 100.23 and 56.26 is: 77.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.70 : 100.23 = 56.26 : x
  2. Step 2: Convert to fraction form
    72.70/100.23 = 56.26/x
  3. Step 3: Cross multiply
    72.70x = 100.23 × 56.26
  4. Step 4: Simplify right side
    72.70x = 5,638.94
  5. Step 5: Solve for x
    x = 5,638.94/72.70
  6. Step 6: Final answer
    x = 77.56

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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.