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Finding the Fourth Proportional to 920.82, 1,381.08 and 690.06

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Solution

The fourth proportional to 920.82, 1,381.08 and 690.06 is: 1,034.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.82 : 1,381.08 = 690.06 : x
  2. Step 2: Convert to fraction form
    920.82/1,381.08 = 690.06/x
  3. Step 3: Cross multiply
    920.82x = 1,381.08 × 690.06
  4. Step 4: Simplify right side
    920.82x = 953,028.06
  5. Step 5: Solve for x
    x = 953,028.06/920.82
  6. Step 6: Final answer
    x = 1,034.98

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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.