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Finding the Fourth Proportional to 1,293.78, 1,939.86 and 717.06

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Solution

The fourth proportional to 1,293.78, 1,939.86 and 717.06 is: 1,075.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.78 : 1,939.86 = 717.06 : x
  2. Step 2: Convert to fraction form
    1,293.78/1,939.86 = 717.06/x
  3. Step 3: Cross multiply
    1,293.78x = 1,939.86 × 717.06
  4. Step 4: Simplify right side
    1,293.78x = 1,390,996.01
  5. Step 5: Solve for x
    x = 1,390,996.01/1,293.78
  6. Step 6: Final answer
    x = 1,075.14

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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.