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Finding the Fourth Proportional to 778.09, 1,073.70 and 483.30

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Solution

The fourth proportional to 778.09, 1,073.70 and 483.30 is: 666.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.09 : 1,073.70 = 483.30 : x
  2. Step 2: Convert to fraction form
    778.09/1,073.70 = 483.30/x
  3. Step 3: Cross multiply
    778.09x = 1,073.70 × 483.30
  4. Step 4: Simplify right side
    778.09x = 518,919.21
  5. Step 5: Solve for x
    x = 518,919.21/778.09
  6. Step 6: Final answer
    x = 666.92

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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.