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Finding the Fourth Proportional to 64.28, 88.72 and 42.18

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Solution

The fourth proportional to 64.28, 88.72 and 42.18 is: 58.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.28 : 88.72 = 42.18 : x
  2. Step 2: Convert to fraction form
    64.28/88.72 = 42.18/x
  3. Step 3: Cross multiply
    64.28x = 88.72 × 42.18
  4. Step 4: Simplify right side
    64.28x = 3,742.21
  5. Step 5: Solve for x
    x = 3,742.21/64.28
  6. Step 6: Final answer
    x = 58.22

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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.