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Finding the Fourth Proportional to 72.64, 100.12 and 56.23

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Solution

The fourth proportional to 72.64, 100.12 and 56.23 is: 77.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.64 : 100.12 = 56.23 : x
  2. Step 2: Convert to fraction form
    72.64/100.12 = 56.23/x
  3. Step 3: Cross multiply
    72.64x = 100.12 × 56.23
  4. Step 4: Simplify right side
    72.64x = 5,629.75
  5. Step 5: Solve for x
    x = 5,629.75/72.64
  6. Step 6: Final answer
    x = 77.50

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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.