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Finding the Fourth Proportional to 77.88, 107.64 and 56.10

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Solution

The fourth proportional to 77.88, 107.64 and 56.10 is: 77.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.88 : 107.64 = 56.10 : x
  2. Step 2: Convert to fraction form
    77.88/107.64 = 56.10/x
  3. Step 3: Cross multiply
    77.88x = 107.64 × 56.10
  4. Step 4: Simplify right side
    77.88x = 6,038.60
  5. Step 5: Solve for x
    x = 6,038.60/77.88
  6. Step 6: Final answer
    x = 77.54

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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.