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Finding the Fourth Proportional to 75.81, 104.70 and 56.51

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Solution

The fourth proportional to 75.81, 104.70 and 56.51 is: 78.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.81 : 104.70 = 56.51 : x
  2. Step 2: Convert to fraction form
    75.81/104.70 = 56.51/x
  3. Step 3: Cross multiply
    75.81x = 104.70 × 56.51
  4. Step 4: Simplify right side
    75.81x = 5,916.60
  5. Step 5: Solve for x
    x = 5,916.60/75.81
  6. Step 6: Final answer
    x = 78.05

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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.