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Finding the Fourth Proportional to 854.71, 1,281.44 and 690.38

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Solution

The fourth proportional to 854.71, 1,281.44 and 690.38 is: 1,035.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.71 : 1,281.44 = 690.38 : x
  2. Step 2: Convert to fraction form
    854.71/1,281.44 = 690.38/x
  3. Step 3: Cross multiply
    854.71x = 1,281.44 × 690.38
  4. Step 4: Simplify right side
    854.71x = 884,680.67
  5. Step 5: Solve for x
    x = 884,680.67/854.71
  6. Step 6: Final answer
    x = 1,035.07

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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.