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Finding the Fourth Proportional to 64.28, 88.47 and 49.70

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Solution

The fourth proportional to 64.28, 88.47 and 49.70 is: 68.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.28 : 88.47 = 49.70 : x
  2. Step 2: Convert to fraction form
    64.28/88.47 = 49.70/x
  3. Step 3: Cross multiply
    64.28x = 88.47 × 49.70
  4. Step 4: Simplify right side
    64.28x = 4,396.96
  5. Step 5: Solve for x
    x = 4,396.96/64.28
  6. Step 6: Final answer
    x = 68.40

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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.