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Finding the Fourth Proportional to 807.40, 1,210.56 and 519.04

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Solution

The fourth proportional to 807.40, 1,210.56 and 519.04 is: 778.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.40 : 1,210.56 = 519.04 : x
  2. Step 2: Convert to fraction form
    807.40/1,210.56 = 519.04/x
  3. Step 3: Cross multiply
    807.40x = 1,210.56 × 519.04
  4. Step 4: Simplify right side
    807.40x = 628,329.06
  5. Step 5: Solve for x
    x = 628,329.06/807.40
  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.