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Finding the Fourth Proportional to 1.15, 1.58 and 0.88

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Solution

The fourth proportional to 1.15, 1.58 and 0.88 is: 1.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.15 : 1.58 = 0.88 : x
  2. Step 2: Convert to fraction form
    1.15/1.58 = 0.88/x
  3. Step 3: Cross multiply
    1.15x = 1.58 × 0.88
  4. Step 4: Simplify right side
    1.15x = 1.39
  5. Step 5: Solve for x
    x = 1.39/1.15
  6. Step 6: Final answer
    x = 1.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.