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Finding the Fourth Proportional to 5.25, 7.88 and 1.45

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Solution

The fourth proportional to 5.25, 7.88 and 1.45 is: 2.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.25 : 7.88 = 1.45 : x
  2. Step 2: Convert to fraction form
    5.25/7.88 = 1.45/x
  3. Step 3: Cross multiply
    5.25x = 7.88 × 1.45
  4. Step 4: Simplify right side
    5.25x = 11.40
  5. Step 5: Solve for x
    x = 11.40/5.25
  6. Step 6: Final answer
    x = 2.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.