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Finding the Fourth Proportional to 104.74, 156.91 and 39.70

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Solution

The fourth proportional to 104.74, 156.91 and 39.70 is: 59.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.74 : 156.91 = 39.70 : x
  2. Step 2: Convert to fraction form
    104.74/156.91 = 39.70/x
  3. Step 3: Cross multiply
    104.74x = 156.91 × 39.70
  4. Step 4: Simplify right side
    104.74x = 6,228.84
  5. Step 5: Solve for x
    x = 6,228.84/104.74
  6. Step 6: Final answer
    x = 59.47

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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.