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Finding the Fourth Proportional to 1,718.78, 2,578 and 939.13

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Solution

The fourth proportional to 1,718.78, 2,578 and 939.13 is: 1,408.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.78 : 2,578 = 939.13 : x
  2. Step 2: Convert to fraction form
    1,718.78/2,578 = 939.13/x
  3. Step 3: Cross multiply
    1,718.78x = 2,578 × 939.13
  4. Step 4: Simplify right side
    1,718.78x = 2,421,077.14
  5. Step 5: Solve for x
    x = 2,421,077.14/1,718.78
  6. Step 6: Final answer
    x = 1,408.60

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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.