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Finding the Fourth Proportional to 809.60, 1,116.99 and 478.04

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Solution

The fourth proportional to 809.60, 1,116.99 and 478.04 is: 659.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.60 : 1,116.99 = 478.04 : x
  2. Step 2: Convert to fraction form
    809.60/1,116.99 = 478.04/x
  3. Step 3: Cross multiply
    809.60x = 1,116.99 × 478.04
  4. Step 4: Simplify right side
    809.60x = 533,960.31
  5. Step 5: Solve for x
    x = 533,960.31/809.60
  6. Step 6: Final answer
    x = 659.54

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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.