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Finding the Fourth Proportional to 0.90, 1.24 and 0.85

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Solution

The fourth proportional to 0.90, 1.24 and 0.85 is: 1.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.90 : 1.24 = 0.85 : x
  2. Step 2: Convert to fraction form
    0.90/1.24 = 0.85/x
  3. Step 3: Cross multiply
    0.90x = 1.24 × 0.85
  4. Step 4: Simplify right side
    0.90x = 1.05
  5. Step 5: Solve for x
    x = 1.05/0.90
  6. Step 6: Final answer
    x = 1.17

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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.