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Finding the Fourth Proportional to 64.28, 88.82 and 56.26

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Solution

The fourth proportional to 64.28, 88.82 and 56.26 is: 77.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.28 : 88.82 = 56.26 : x
  2. Step 2: Convert to fraction form
    64.28/88.82 = 56.26/x
  3. Step 3: Cross multiply
    64.28x = 88.82 × 56.26
  4. Step 4: Simplify right side
    64.28x = 4,997.01
  5. Step 5: Solve for x
    x = 4,997.01/64.28
  6. Step 6: Final answer
    x = 77.74

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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.