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Finding the Fourth Proportional to 47.02, 70.54 and 12.78

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Solution

The fourth proportional to 47.02, 70.54 and 12.78 is: 19.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.02 : 70.54 = 12.78 : x
  2. Step 2: Convert to fraction form
    47.02/70.54 = 12.78/x
  3. Step 3: Cross multiply
    47.02x = 70.54 × 12.78
  4. Step 4: Simplify right side
    47.02x = 901.47
  5. Step 5: Solve for x
    x = 901.47/47.02
  6. Step 6: Final answer
    x = 19.17

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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.