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Finding the Fourth Proportional to 47.04, 70.38 and 45.90

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Solution

The fourth proportional to 47.04, 70.38 and 45.90 is: 68.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.04 : 70.38 = 45.90 : x
  2. Step 2: Convert to fraction form
    47.04/70.38 = 45.90/x
  3. Step 3: Cross multiply
    47.04x = 70.38 × 45.90
  4. Step 4: Simplify right side
    47.04x = 3,230.44
  5. Step 5: Solve for x
    x = 3,230.44/47.04
  6. Step 6: Final answer
    x = 68.67

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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.