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Finding the Fourth Proportional to 1,325.82, 1,990.53 and 913.94

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Solution

The fourth proportional to 1,325.82, 1,990.53 and 913.94 is: 1,372.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.82 : 1,990.53 = 913.94 : x
  2. Step 2: Convert to fraction form
    1,325.82/1,990.53 = 913.94/x
  3. Step 3: Cross multiply
    1,325.82x = 1,990.53 × 913.94
  4. Step 4: Simplify right side
    1,325.82x = 1,819,215.04
  5. Step 5: Solve for x
    x = 1,819,215.04/1,325.82
  6. Step 6: Final answer
    x = 1,372.14

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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.