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Finding the Fourth Proportional to 59.51, 82.15 and 39.87

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Solution

The fourth proportional to 59.51, 82.15 and 39.87 is: 55.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.51 : 82.15 = 39.87 : x
  2. Step 2: Convert to fraction form
    59.51/82.15 = 39.87/x
  3. Step 3: Cross multiply
    59.51x = 82.15 × 39.87
  4. Step 4: Simplify right side
    59.51x = 3,275.22
  5. Step 5: Solve for x
    x = 3,275.22/59.51
  6. Step 6: Final answer
    x = 55.03

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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.