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Finding the Fourth Proportional to 1,309.87, 1,807.68 and 786.07

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Solution

The fourth proportional to 1,309.87, 1,807.68 and 786.07 is: 1,084.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.87 : 1,807.68 = 786.07 : x
  2. Step 2: Convert to fraction form
    1,309.87/1,807.68 = 786.07/x
  3. Step 3: Cross multiply
    1,309.87x = 1,807.68 × 786.07
  4. Step 4: Simplify right side
    1,309.87x = 1,420,963.02
  5. Step 5: Solve for x
    x = 1,420,963.02/1,309.87
  6. Step 6: Final answer
    x = 1,084.81

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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.