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Finding the Fourth Proportional to 809.82, 1,117.68 and 612.99

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Solution

The fourth proportional to 809.82, 1,117.68 and 612.99 is: 846.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.82 : 1,117.68 = 612.99 : x
  2. Step 2: Convert to fraction form
    809.82/1,117.68 = 612.99/x
  3. Step 3: Cross multiply
    809.82x = 1,117.68 × 612.99
  4. Step 4: Simplify right side
    809.82x = 685,126.66
  5. Step 5: Solve for x
    x = 685,126.66/809.82
  6. Step 6: Final answer
    x = 846.02

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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.