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Finding the Fourth Proportional to 1,717.64, 2,372.18 and 1,389.64

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Solution

The fourth proportional to 1,717.64, 2,372.18 and 1,389.64 is: 1,919.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,717.64 : 2,372.18 = 1,389.64 : x
  2. Step 2: Convert to fraction form
    1,717.64/2,372.18 = 1,389.64/x
  3. Step 3: Cross multiply
    1,717.64x = 2,372.18 × 1,389.64
  4. Step 4: Simplify right side
    1,717.64x = 3,296,476.22
  5. Step 5: Solve for x
    x = 3,296,476.22/1,717.64
  6. Step 6: Final answer
    x = 1,919.19

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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.