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Finding the Fourth Proportional to 75.51, 113.70 and 56.39

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Solution

The fourth proportional to 75.51, 113.70 and 56.39 is: 84.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.51 : 113.70 = 56.39 : x
  2. Step 2: Convert to fraction form
    75.51/113.70 = 56.39/x
  3. Step 3: Cross multiply
    75.51x = 113.70 × 56.39
  4. Step 4: Simplify right side
    75.51x = 6,410.97
  5. Step 5: Solve for x
    x = 6,410.97/75.51
  6. Step 6: Final answer
    x = 84.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.