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Finding the Fourth Proportional to 47.35, 70.66 and 40.87

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Solution

The fourth proportional to 47.35, 70.66 and 40.87 is: 60.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.35 : 70.66 = 40.87 : x
  2. Step 2: Convert to fraction form
    47.35/70.66 = 40.87/x
  3. Step 3: Cross multiply
    47.35x = 70.66 × 40.87
  4. Step 4: Simplify right side
    47.35x = 2,887.87
  5. Step 5: Solve for x
    x = 2,887.87/47.35
  6. Step 6: Final answer
    x = 60.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.