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Finding the Fourth Proportional to 1,422.72, 2,133.90 and 545.04

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Solution

The fourth proportional to 1,422.72, 2,133.90 and 545.04 is: 817.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.72 : 2,133.90 = 545.04 : x
  2. Step 2: Convert to fraction form
    1,422.72/2,133.90 = 545.04/x
  3. Step 3: Cross multiply
    1,422.72x = 2,133.90 × 545.04
  4. Step 4: Simplify right side
    1,422.72x = 1,163,060.86
  5. Step 5: Solve for x
    x = 1,163,060.86/1,422.72
  6. Step 6: Final answer
    x = 817.49

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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.