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Finding the Fourth Proportional to 71.40, 106.29 and 70.62

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Solution

The fourth proportional to 71.40, 106.29 and 70.62 is: 105.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.40 : 106.29 = 70.62 : x
  2. Step 2: Convert to fraction form
    71.40/106.29 = 70.62/x
  3. Step 3: Cross multiply
    71.40x = 106.29 × 70.62
  4. Step 4: Simplify right side
    71.40x = 7,506.20
  5. Step 5: Solve for x
    x = 7,506.20/71.40
  6. Step 6: Final answer
    x = 105.13

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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.