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Finding the Fourth Proportional to 55.99, 77.18 and 39.60

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Solution

The fourth proportional to 55.99, 77.18 and 39.60 is: 54.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.99 : 77.18 = 39.60 : x
  2. Step 2: Convert to fraction form
    55.99/77.18 = 39.60/x
  3. Step 3: Cross multiply
    55.99x = 77.18 × 39.60
  4. Step 4: Simplify right side
    55.99x = 3,055.74
  5. Step 5: Solve for x
    x = 3,055.74/55.99
  6. Step 6: Final answer
    x = 54.58

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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.