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Finding the Fourth Proportional to 1,038.49, 1,433.23 and 645.57

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Solution

The fourth proportional to 1,038.49, 1,433.23 and 645.57 is: 890.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.49 : 1,433.23 = 645.57 : x
  2. Step 2: Convert to fraction form
    1,038.49/1,433.23 = 645.57/x
  3. Step 3: Cross multiply
    1,038.49x = 1,433.23 × 645.57
  4. Step 4: Simplify right side
    1,038.49x = 925,248.68
  5. Step 5: Solve for x
    x = 925,248.68/1,038.49
  6. Step 6: Final answer
    x = 890.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.