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Finding the Fourth Proportional to 1,247.41, 1,869.44 and 690.81

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Solution

The fourth proportional to 1,247.41, 1,869.44 and 690.81 is: 1,035.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.41 : 1,869.44 = 690.81 : x
  2. Step 2: Convert to fraction form
    1,247.41/1,869.44 = 690.81/x
  3. Step 3: Cross multiply
    1,247.41x = 1,869.44 × 690.81
  4. Step 4: Simplify right side
    1,247.41x = 1,291,419.72
  5. Step 5: Solve for x
    x = 1,291,419.72/1,247.41
  6. Step 6: Final answer
    x = 1,035.28

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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.