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Finding the Fourth Proportional to 40.83, 56.40 and 28.59

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Solution

The fourth proportional to 40.83, 56.40 and 28.59 is: 39.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.83 : 56.40 = 28.59 : x
  2. Step 2: Convert to fraction form
    40.83/56.40 = 28.59/x
  3. Step 3: Cross multiply
    40.83x = 56.40 × 28.59
  4. Step 4: Simplify right side
    40.83x = 1,612.48
  5. Step 5: Solve for x
    x = 1,612.48/40.83
  6. Step 6: Final answer
    x = 39.49

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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.