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Finding the Fourth Proportional to 0.57, 0.78 and 0.31

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Solution

The fourth proportional to 0.57, 0.78 and 0.31 is: 0.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.57 : 0.78 = 0.31 : x
  2. Step 2: Convert to fraction form
    0.57/0.78 = 0.31/x
  3. Step 3: Cross multiply
    0.57x = 0.78 × 0.31
  4. Step 4: Simplify right side
    0.57x = 0.25
  5. Step 5: Solve for x
    x = 0.25/0.57
  6. Step 6: Final answer
    x = 0.43

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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.