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Finding the Fourth Proportional to 1,129.87, 1,693.90 and 545.05

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Solution

The fourth proportional to 1,129.87, 1,693.90 and 545.05 is: 817.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.87 : 1,693.90 = 545.05 : x
  2. Step 2: Convert to fraction form
    1,129.87/1,693.90 = 545.05/x
  3. Step 3: Cross multiply
    1,129.87x = 1,693.90 × 545.05
  4. Step 4: Simplify right side
    1,129.87x = 923,249.00
  5. Step 5: Solve for x
    x = 923,249.00/1,129.87
  6. Step 6: Final answer
    x = 817.13

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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.