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Finding the Fourth Proportional to 79.32, 109.48 and 53.13

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Solution

The fourth proportional to 79.32, 109.48 and 53.13 is: 73.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.32 : 109.48 = 53.13 : x
  2. Step 2: Convert to fraction form
    79.32/109.48 = 53.13/x
  3. Step 3: Cross multiply
    79.32x = 109.48 × 53.13
  4. Step 4: Simplify right side
    79.32x = 5,816.40
  5. Step 5: Solve for x
    x = 5,816.40/79.32
  6. Step 6: Final answer
    x = 73.33

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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.