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Finding the Fourth Proportional to 809.78, 1,117.30 and 460.66

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Solution

The fourth proportional to 809.78, 1,117.30 and 460.66 is: 635.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.78 : 1,117.30 = 460.66 : x
  2. Step 2: Convert to fraction form
    809.78/1,117.30 = 460.66/x
  3. Step 3: Cross multiply
    809.78x = 1,117.30 × 460.66
  4. Step 4: Simplify right side
    809.78x = 514,688.68
  5. Step 5: Solve for x
    x = 514,688.68/809.78
  6. Step 6: Final answer
    x = 635.59

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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.