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Finding the Fourth Proportional to 4.30, 6.40 and 4.18

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Solution

The fourth proportional to 4.30, 6.40 and 4.18 is: 6.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.30 : 6.40 = 4.18 : x
  2. Step 2: Convert to fraction form
    4.30/6.40 = 4.18/x
  3. Step 3: Cross multiply
    4.30x = 6.40 × 4.18
  4. Step 4: Simplify right side
    4.30x = 26.75
  5. Step 5: Solve for x
    x = 26.75/4.30
  6. Step 6: Final answer
    x = 6.22

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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.