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Finding the Fourth Proportional to 1,718.42, 2,576.36 and 1,389.76

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Solution

The fourth proportional to 1,718.42, 2,576.36 and 1,389.76 is: 2,083.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.42 : 2,576.36 = 1,389.76 : x
  2. Step 2: Convert to fraction form
    1,718.42/2,576.36 = 1,389.76/x
  3. Step 3: Cross multiply
    1,718.42x = 2,576.36 × 1,389.76
  4. Step 4: Simplify right side
    1,718.42x = 3,580,519.11
  5. Step 5: Solve for x
    x = 3,580,519.11/1,718.42
  6. Step 6: Final answer
    x = 2,083.62

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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.