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Finding the Fourth Proportional to 13.59, 18.75 and 7.45

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Solution

The fourth proportional to 13.59, 18.75 and 7.45 is: 10.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.59 : 18.75 = 7.45 : x
  2. Step 2: Convert to fraction form
    13.59/18.75 = 7.45/x
  3. Step 3: Cross multiply
    13.59x = 18.75 × 7.45
  4. Step 4: Simplify right side
    13.59x = 139.67
  5. Step 5: Solve for x
    x = 139.67/13.59
  6. Step 6: Final answer
    x = 10.28

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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.