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Finding the Fourth Proportional to 1,909.80, 2,859.30 and 1,715.40

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Solution

The fourth proportional to 1,909.80, 2,859.30 and 1,715.40 is: 2,568.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.80 : 2,859.30 = 1,715.40 : x
  2. Step 2: Convert to fraction form
    1,909.80/2,859.30 = 1,715.40/x
  3. Step 3: Cross multiply
    1,909.80x = 2,859.30 × 1,715.40
  4. Step 4: Simplify right side
    1,909.80x = 4,904,843.22
  5. Step 5: Solve for x
    x = 4,904,843.22/1,909.80
  6. Step 6: Final answer
    x = 2,568.25

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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.