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Finding the Fourth Proportional to 65.10, 89.74 and 64.28

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Solution

The fourth proportional to 65.10, 89.74 and 64.28 is: 88.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.10 : 89.74 = 64.28 : x
  2. Step 2: Convert to fraction form
    65.10/89.74 = 64.28/x
  3. Step 3: Cross multiply
    65.10x = 89.74 × 64.28
  4. Step 4: Simplify right side
    65.10x = 5,768.49
  5. Step 5: Solve for x
    x = 5,768.49/65.10
  6. Step 6: Final answer
    x = 88.61

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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.