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Finding the Fourth Proportional to 949.60, 1,309.99 and 818.38

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Solution

The fourth proportional to 949.60, 1,309.99 and 818.38 is: 1,128.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.60 : 1,309.99 = 818.38 : x
  2. Step 2: Convert to fraction form
    949.60/1,309.99 = 818.38/x
  3. Step 3: Cross multiply
    949.60x = 1,309.99 × 818.38
  4. Step 4: Simplify right side
    949.60x = 1,072,058.97
  5. Step 5: Solve for x
    x = 1,072,058.97/949.60
  6. Step 6: Final answer
    x = 1,128.96

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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.