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Finding the Fourth Proportional to 1,270.68, 1,902.43 and 807.31

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Solution

The fourth proportional to 1,270.68, 1,902.43 and 807.31 is: 1,208.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.68 : 1,902.43 = 807.31 : x
  2. Step 2: Convert to fraction form
    1,270.68/1,902.43 = 807.31/x
  3. Step 3: Cross multiply
    1,270.68x = 1,902.43 × 807.31
  4. Step 4: Simplify right side
    1,270.68x = 1,535,846.73
  5. Step 5: Solve for x
    x = 1,535,846.73/1,270.68
  6. Step 6: Final answer
    x = 1,208.68

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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.