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Finding the Fourth Proportional to 807.17, 1,210.75 and 518.81

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Solution

The fourth proportional to 807.17, 1,210.75 and 518.81 is: 778.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.17 : 1,210.75 = 518.81 : x
  2. Step 2: Convert to fraction form
    807.17/1,210.75 = 518.81/x
  3. Step 3: Cross multiply
    807.17x = 1,210.75 × 518.81
  4. Step 4: Simplify right side
    807.17x = 628,141.86
  5. Step 5: Solve for x
    x = 628,141.86/807.17
  6. Step 6: Final answer
    x = 778.21

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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.