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Finding the Fourth Proportional to 807.85, 1,210.99 and 259.68

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Solution

The fourth proportional to 807.85, 1,210.99 and 259.68 is: 389.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.85 : 1,210.99 = 259.68 : x
  2. Step 2: Convert to fraction form
    807.85/1,210.99 = 259.68/x
  3. Step 3: Cross multiply
    807.85x = 1,210.99 × 259.68
  4. Step 4: Simplify right side
    807.85x = 314,468.58
  5. Step 5: Solve for x
    x = 314,468.58/807.85
  6. Step 6: Final answer
    x = 389.27

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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.