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Finding the Fourth Proportional to 817.85, 1,225.10 and 680.45

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Solution

The fourth proportional to 817.85, 1,225.10 and 680.45 is: 1,019.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.85 : 1,225.10 = 680.45 : x
  2. Step 2: Convert to fraction form
    817.85/1,225.10 = 680.45/x
  3. Step 3: Cross multiply
    817.85x = 1,225.10 × 680.45
  4. Step 4: Simplify right side
    817.85x = 833,612.83
  5. Step 5: Solve for x
    x = 833,612.83/817.85
  6. Step 6: Final answer
    x = 1,019.28

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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.