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Finding the Fourth Proportional to 1,568.81, 2,163.72 and 1,389.55

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Solution

The fourth proportional to 1,568.81, 2,163.72 and 1,389.55 is: 1,916.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,568.81 : 2,163.72 = 1,389.55 : x
  2. Step 2: Convert to fraction form
    1,568.81/2,163.72 = 1,389.55/x
  3. Step 3: Cross multiply
    1,568.81x = 2,163.72 × 1,389.55
  4. Step 4: Simplify right side
    1,568.81x = 3,006,590.99
  5. Step 5: Solve for x
    x = 3,006,590.99/1,568.81
  6. Step 6: Final answer
    x = 1,916.48

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1.5x scale

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.