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Finding the Fourth Proportional to 809.59, 1,117.87 and 651.72

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Solution

The fourth proportional to 809.59, 1,117.87 and 651.72 is: 899.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.59 : 1,117.87 = 651.72 : x
  2. Step 2: Convert to fraction form
    809.59/1,117.87 = 651.72/x
  3. Step 3: Cross multiply
    809.59x = 1,117.87 × 651.72
  4. Step 4: Simplify right side
    809.59x = 728,529.39
  5. Step 5: Solve for x
    x = 728,529.39/809.59
  6. Step 6: Final answer
    x = 899.88

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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.