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Finding the Fourth Proportional to 806.39, 1,111.67 and 631.43

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Solution

The fourth proportional to 806.39, 1,111.67 and 631.43 is: 870.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.39 : 1,111.67 = 631.43 : x
  2. Step 2: Convert to fraction form
    806.39/1,111.67 = 631.43/x
  3. Step 3: Cross multiply
    806.39x = 1,111.67 × 631.43
  4. Step 4: Simplify right side
    806.39x = 701,943.16
  5. Step 5: Solve for x
    x = 701,943.16/806.39
  6. Step 6: Final answer
    x = 870.48

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1.5x scale

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.