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Finding the Fourth Proportional to 75.22, 103.55 and 56.77

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Solution

The fourth proportional to 75.22, 103.55 and 56.77 is: 78.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.22 : 103.55 = 56.77 : x
  2. Step 2: Convert to fraction form
    75.22/103.55 = 56.77/x
  3. Step 3: Cross multiply
    75.22x = 103.55 × 56.77
  4. Step 4: Simplify right side
    75.22x = 5,877.99
  5. Step 5: Solve for x
    x = 5,877.99/75.22
  6. Step 6: Final answer
    x = 78.15

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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.