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Finding the Fourth Proportional to 1,309.54, 1,807.20 and 785.46

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Solution

The fourth proportional to 1,309.54, 1,807.20 and 785.46 is: 1,083.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.54 : 1,807.20 = 785.46 : x
  2. Step 2: Convert to fraction form
    1,309.54/1,807.20 = 785.46/x
  3. Step 3: Cross multiply
    1,309.54x = 1,807.20 × 785.46
  4. Step 4: Simplify right side
    1,309.54x = 1,419,483.31
  5. Step 5: Solve for x
    x = 1,419,483.31/1,309.54
  6. Step 6: Final answer
    x = 1,083.96

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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.