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Finding the Fourth Proportional to 947, 1,305.96 and 615.68

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Solution

The fourth proportional to 947, 1,305.96 and 615.68 is: 849.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    947 : 1,305.96 = 615.68 : x
  2. Step 2: Convert to fraction form
    947/1,305.96 = 615.68/x
  3. Step 3: Cross multiply
    947x = 1,305.96 × 615.68
  4. Step 4: Simplify right side
    947x = 804,053.45
  5. Step 5: Solve for x
    x = 804,053.45/947
  6. Step 6: Final answer
    x = 849.05

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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.