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Finding the Fourth Proportional to 75.45, 112.86 and 56.25

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Solution

The fourth proportional to 75.45, 112.86 and 56.25 is: 84.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.45 : 112.86 = 56.25 : x
  2. Step 2: Convert to fraction form
    75.45/112.86 = 56.25/x
  3. Step 3: Cross multiply
    75.45x = 112.86 × 56.25
  4. Step 4: Simplify right side
    75.45x = 6,348.38
  5. Step 5: Solve for x
    x = 6,348.38/75.45
  6. Step 6: Final answer
    x = 84.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.