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Finding the Fourth Proportional to 913.97, 1,372.12 and 784.80

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Solution

The fourth proportional to 913.97, 1,372.12 and 784.80 is: 1,178.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.97 : 1,372.12 = 784.80 : x
  2. Step 2: Convert to fraction form
    913.97/1,372.12 = 784.80/x
  3. Step 3: Cross multiply
    913.97x = 1,372.12 × 784.80
  4. Step 4: Simplify right side
    913.97x = 1,076,832.92
  5. Step 5: Solve for x
    x = 1,076,832.92/913.97
  6. Step 6: Final answer
    x = 1,178.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.