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Finding the Fourth Proportional to 764.78, 1,053.88 and 543.11

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Solution

The fourth proportional to 764.78, 1,053.88 and 543.11 is: 748.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.78 : 1,053.88 = 543.11 : x
  2. Step 2: Convert to fraction form
    764.78/1,053.88 = 543.11/x
  3. Step 3: Cross multiply
    764.78x = 1,053.88 × 543.11
  4. Step 4: Simplify right side
    764.78x = 572,366.14
  5. Step 5: Solve for x
    x = 572,366.14/764.78
  6. Step 6: Final answer
    x = 748.41

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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.