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Finding the Fourth Proportional to 65.81, 99.02 and 46.78

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Solution

The fourth proportional to 65.81, 99.02 and 46.78 is: 70.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.81 : 99.02 = 46.78 : x
  2. Step 2: Convert to fraction form
    65.81/99.02 = 46.78/x
  3. Step 3: Cross multiply
    65.81x = 99.02 × 46.78
  4. Step 4: Simplify right side
    65.81x = 4,632.02
  5. Step 5: Solve for x
    x = 4,632.02/65.81
  6. Step 6: Final answer
    x = 70.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.