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Finding the Fourth Proportional to 1,125.91, 1,553.61 and 653.41

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Solution

The fourth proportional to 1,125.91, 1,553.61 and 653.41 is: 901.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.91 : 1,553.61 = 653.41 : x
  2. Step 2: Convert to fraction form
    1,125.91/1,553.61 = 653.41/x
  3. Step 3: Cross multiply
    1,125.91x = 1,553.61 × 653.41
  4. Step 4: Simplify right side
    1,125.91x = 1,015,144.31
  5. Step 5: Solve for x
    x = 1,015,144.31/1,125.91
  6. Step 6: Final answer
    x = 901.62

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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.