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Finding the Fourth Proportional to 1.53, 2.11 and 1.17

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Solution

The fourth proportional to 1.53, 2.11 and 1.17 is: 1.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.53 : 2.11 = 1.17 : x
  2. Step 2: Convert to fraction form
    1.53/2.11 = 1.17/x
  3. Step 3: Cross multiply
    1.53x = 2.11 × 1.17
  4. Step 4: Simplify right side
    1.53x = 2.48
  5. Step 5: Solve for x
    x = 2.48/1.53
  6. Step 6: Final answer
    x = 1.62

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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.