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Finding the Fourth Proportional to 764.77, 1,148.55 and 680.05

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Solution

The fourth proportional to 764.77, 1,148.55 and 680.05 is: 1,021.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.77 : 1,148.55 = 680.05 : x
  2. Step 2: Convert to fraction form
    764.77/1,148.55 = 680.05/x
  3. Step 3: Cross multiply
    764.77x = 1,148.55 × 680.05
  4. Step 4: Simplify right side
    764.77x = 781,071.43
  5. Step 5: Solve for x
    x = 781,071.43/764.77
  6. Step 6: Final answer
    x = 1,021.32

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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.