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Finding the Fourth Proportional to 56.37, 77.70 and 39.99

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Solution

The fourth proportional to 56.37, 77.70 and 39.99 is: 55.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.37 : 77.70 = 39.99 : x
  2. Step 2: Convert to fraction form
    56.37/77.70 = 39.99/x
  3. Step 3: Cross multiply
    56.37x = 77.70 × 39.99
  4. Step 4: Simplify right side
    56.37x = 3,107.22
  5. Step 5: Solve for x
    x = 3,107.22/56.37
  6. Step 6: Final answer
    x = 55.12

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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.