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Finding the Fourth Proportional to 1,443.67, 2,165.02 and 621.11

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Solution

The fourth proportional to 1,443.67, 2,165.02 and 621.11 is: 931.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,443.67 : 2,165.02 = 621.11 : x
  2. Step 2: Convert to fraction form
    1,443.67/2,165.02 = 621.11/x
  3. Step 3: Cross multiply
    1,443.67x = 2,165.02 × 621.11
  4. Step 4: Simplify right side
    1,443.67x = 1,344,715.57
  5. Step 5: Solve for x
    x = 1,344,715.57/1,443.67
  6. Step 6: Final answer
    x = 931.46

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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.