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Finding the Fourth Proportional to 85.20, 117.51 and 70.62

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Solution

The fourth proportional to 85.20, 117.51 and 70.62 is: 97.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.20 : 117.51 = 70.62 : x
  2. Step 2: Convert to fraction form
    85.20/117.51 = 70.62/x
  3. Step 3: Cross multiply
    85.20x = 117.51 × 70.62
  4. Step 4: Simplify right side
    85.20x = 8,298.56
  5. Step 5: Solve for x
    x = 8,298.56/85.20
  6. Step 6: Final answer
    x = 97.40

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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.