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Finding the Fourth Proportional to 8.58, 12.90 and 7.46

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Solution

The fourth proportional to 8.58, 12.90 and 7.46 is: 11.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.58 : 12.90 = 7.46 : x
  2. Step 2: Convert to fraction form
    8.58/12.90 = 7.46/x
  3. Step 3: Cross multiply
    8.58x = 12.90 × 7.46
  4. Step 4: Simplify right side
    8.58x = 96.23
  5. Step 5: Solve for x
    x = 96.23/8.58
  6. Step 6: Final answer
    x = 11.22

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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.