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Finding the Fourth Proportional to 64.28, 88.74 and 51.32

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Solution

The fourth proportional to 64.28, 88.74 and 51.32 is: 70.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.28 : 88.74 = 51.32 : x
  2. Step 2: Convert to fraction form
    64.28/88.74 = 51.32/x
  3. Step 3: Cross multiply
    64.28x = 88.74 × 51.32
  4. Step 4: Simplify right side
    64.28x = 4,554.14
  5. Step 5: Solve for x
    x = 4,554.14/64.28
  6. Step 6: Final answer
    x = 70.85

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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.