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Finding the Fourth Proportional to 70.53, 105.66 and 56.81

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Solution

The fourth proportional to 70.53, 105.66 and 56.81 is: 85.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.53 : 105.66 = 56.81 : x
  2. Step 2: Convert to fraction form
    70.53/105.66 = 56.81/x
  3. Step 3: Cross multiply
    70.53x = 105.66 × 56.81
  4. Step 4: Simplify right side
    70.53x = 6,002.02
  5. Step 5: Solve for x
    x = 6,002.02/70.53
  6. Step 6: Final answer
    x = 85.10

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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.