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Finding the Fourth Proportional to 786.72, 1,179.45 and 543.72

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Solution

The fourth proportional to 786.72, 1,179.45 and 543.72 is: 815.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.72 : 1,179.45 = 543.72 : x
  2. Step 2: Convert to fraction form
    786.72/1,179.45 = 543.72/x
  3. Step 3: Cross multiply
    786.72x = 1,179.45 × 543.72
  4. Step 4: Simplify right side
    786.72x = 641,290.55
  5. Step 5: Solve for x
    x = 641,290.55/786.72
  6. Step 6: Final answer
    x = 815.14

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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.