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Finding the Fourth Proportional to 4.64, 6.40 and 3.56

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Solution

The fourth proportional to 4.64, 6.40 and 3.56 is: 4.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.64 : 6.40 = 3.56 : x
  2. Step 2: Convert to fraction form
    4.64/6.40 = 3.56/x
  3. Step 3: Cross multiply
    4.64x = 6.40 × 3.56
  4. Step 4: Simplify right side
    4.64x = 22.78
  5. Step 5: Solve for x
    x = 22.78/4.64
  6. Step 6: Final answer
    x = 4.91

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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.