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Finding the Fourth Proportional to 778.63, 1,074.18 and 660.10

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Solution

The fourth proportional to 778.63, 1,074.18 and 660.10 is: 910.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.63 : 1,074.18 = 660.10 : x
  2. Step 2: Convert to fraction form
    778.63/1,074.18 = 660.10/x
  3. Step 3: Cross multiply
    778.63x = 1,074.18 × 660.10
  4. Step 4: Simplify right side
    778.63x = 709,066.22
  5. Step 5: Solve for x
    x = 709,066.22/778.63
  6. Step 6: Final answer
    x = 910.66

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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.