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Finding the Fourth Proportional to 39.79, 59.59 and 30.70

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Solution

The fourth proportional to 39.79, 59.59 and 30.70 is: 45.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.79 : 59.59 = 30.70 : x
  2. Step 2: Convert to fraction form
    39.79/59.59 = 30.70/x
  3. Step 3: Cross multiply
    39.79x = 59.59 × 30.70
  4. Step 4: Simplify right side
    39.79x = 1,829.41
  5. Step 5: Solve for x
    x = 1,829.41/39.79
  6. Step 6: Final answer
    x = 45.98

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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.