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Finding the Fourth Proportional to 70.47, 105.20 and 61.46

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Solution

The fourth proportional to 70.47, 105.20 and 61.46 is: 91.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.47 : 105.20 = 61.46 : x
  2. Step 2: Convert to fraction form
    70.47/105.20 = 61.46/x
  3. Step 3: Cross multiply
    70.47x = 105.20 × 61.46
  4. Step 4: Simplify right side
    70.47x = 6,465.38
  5. Step 5: Solve for x
    x = 6,465.38/70.47
  6. Step 6: Final answer
    x = 91.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.