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Finding the Fourth Proportional to 809.55, 1,118.75 and 612.72

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Solution

The fourth proportional to 809.55, 1,118.75 and 612.72 is: 846.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.55 : 1,118.75 = 612.72 : x
  2. Step 2: Convert to fraction form
    809.55/1,118.75 = 612.72/x
  3. Step 3: Cross multiply
    809.55x = 1,118.75 × 612.72
  4. Step 4: Simplify right side
    809.55x = 685,477.44
  5. Step 5: Solve for x
    x = 685,477.44/809.55
  6. Step 6: Final answer
    x = 846.74

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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.