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Finding the Fourth Proportional to 1,309.15, 1,807.50 and 812.53

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Solution

The fourth proportional to 1,309.15, 1,807.50 and 812.53 is: 1,121.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.15 : 1,807.50 = 812.53 : x
  2. Step 2: Convert to fraction form
    1,309.15/1,807.50 = 812.53/x
  3. Step 3: Cross multiply
    1,309.15x = 1,807.50 × 812.53
  4. Step 4: Simplify right side
    1,309.15x = 1,468,647.98
  5. Step 5: Solve for x
    x = 1,468,647.98/1,309.15
  6. Step 6: Final answer
    x = 1,121.83

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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.