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Finding the Fourth Proportional to 2,712.40, 4,068.48 and 764.80

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Solution

The fourth proportional to 2,712.40, 4,068.48 and 764.80 is: 1,147.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.40 : 4,068.48 = 764.80 : x
  2. Step 2: Convert to fraction form
    2,712.40/4,068.48 = 764.80/x
  3. Step 3: Cross multiply
    2,712.40x = 4,068.48 × 764.80
  4. Step 4: Simplify right side
    2,712.40x = 3,111,573.50
  5. Step 5: Solve for x
    x = 3,111,573.50/2,712.40
  6. Step 6: Final answer
    x = 1,147.17

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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.