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Finding the Fourth Proportional to 47.02, 64.81 and 40.13

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Solution

The fourth proportional to 47.02, 64.81 and 40.13 is: 55.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.02 : 64.81 = 40.13 : x
  2. Step 2: Convert to fraction form
    47.02/64.81 = 40.13/x
  3. Step 3: Cross multiply
    47.02x = 64.81 × 40.13
  4. Step 4: Simplify right side
    47.02x = 2,600.83
  5. Step 5: Solve for x
    x = 2,600.83/47.02
  6. Step 6: Final answer
    x = 55.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.