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Finding the Fourth Proportional to 40.47, 55.80 and 35.31

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Solution

The fourth proportional to 40.47, 55.80 and 35.31 is: 48.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.47 : 55.80 = 35.31 : x
  2. Step 2: Convert to fraction form
    40.47/55.80 = 35.31/x
  3. Step 3: Cross multiply
    40.47x = 55.80 × 35.31
  4. Step 4: Simplify right side
    40.47x = 1,970.30
  5. Step 5: Solve for x
    x = 1,970.30/40.47
  6. Step 6: Final answer
    x = 48.69

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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.