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Finding the Fourth Proportional to 116.40, 174.51 and 79.80

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Solution

The fourth proportional to 116.40, 174.51 and 79.80 is: 119.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.40 : 174.51 = 79.80 : x
  2. Step 2: Convert to fraction form
    116.40/174.51 = 79.80/x
  3. Step 3: Cross multiply
    116.40x = 174.51 × 79.80
  4. Step 4: Simplify right side
    116.40x = 13,925.90
  5. Step 5: Solve for x
    x = 13,925.90/116.40
  6. Step 6: Final answer
    x = 119.64

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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.