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Finding the Fourth Proportional to 853.71, 1,178.31 and 522.28

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Solution

The fourth proportional to 853.71, 1,178.31 and 522.28 is: 720.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.71 : 1,178.31 = 522.28 : x
  2. Step 2: Convert to fraction form
    853.71/1,178.31 = 522.28/x
  3. Step 3: Cross multiply
    853.71x = 1,178.31 × 522.28
  4. Step 4: Simplify right side
    853.71x = 615,407.75
  5. Step 5: Solve for x
    x = 615,407.75/853.71
  6. Step 6: Final answer
    x = 720.86

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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.