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Finding the Fourth Proportional to 943.12, 1,417.11 and 853.21

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Solution

The fourth proportional to 943.12, 1,417.11 and 853.21 is: 1,282.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.12 : 1,417.11 = 853.21 : x
  2. Step 2: Convert to fraction form
    943.12/1,417.11 = 853.21/x
  3. Step 3: Cross multiply
    943.12x = 1,417.11 × 853.21
  4. Step 4: Simplify right side
    943.12x = 1,209,092.42
  5. Step 5: Solve for x
    x = 1,209,092.42/943.12
  6. Step 6: Final answer
    x = 1,282.01

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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.