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Finding the Fourth Proportional to 40.47, 56.13 and 39.35

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Solution

The fourth proportional to 40.47, 56.13 and 39.35 is: 54.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.47 : 56.13 = 39.35 : x
  2. Step 2: Convert to fraction form
    40.47/56.13 = 39.35/x
  3. Step 3: Cross multiply
    40.47x = 56.13 × 39.35
  4. Step 4: Simplify right side
    40.47x = 2,208.71
  5. Step 5: Solve for x
    x = 2,208.71/40.47
  6. Step 6: Final answer
    x = 54.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.