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Finding the Fourth Proportional to 809.47, 1,117.31 and 529.21

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Solution

The fourth proportional to 809.47, 1,117.31 and 529.21 is: 730.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.47 : 1,117.31 = 529.21 : x
  2. Step 2: Convert to fraction form
    809.47/1,117.31 = 529.21/x
  3. Step 3: Cross multiply
    809.47x = 1,117.31 × 529.21
  4. Step 4: Simplify right side
    809.47x = 591,291.63
  5. Step 5: Solve for x
    x = 591,291.63/809.47
  6. Step 6: Final answer
    x = 730.47

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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.