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Finding the Fourth Proportional to 854.70, 1,281.45 and 690.37

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Solution

The fourth proportional to 854.70, 1,281.45 and 690.37 is: 1,035.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.70 : 1,281.45 = 690.37 : x
  2. Step 2: Convert to fraction form
    854.70/1,281.45 = 690.37/x
  3. Step 3: Cross multiply
    854.70x = 1,281.45 × 690.37
  4. Step 4: Simplify right side
    854.70x = 884,675.40
  5. Step 5: Solve for x
    x = 884,675.40/854.70
  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.