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Finding the Fourth Proportional to 1,869.80, 2,807.90 and 1,812.20

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Solution

The fourth proportional to 1,869.80, 2,807.90 and 1,812.20 is: 2,721.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,869.80 : 2,807.90 = 1,812.20 : x
  2. Step 2: Convert to fraction form
    1,869.80/2,807.90 = 1,812.20/x
  3. Step 3: Cross multiply
    1,869.80x = 2,807.90 × 1,812.20
  4. Step 4: Simplify right side
    1,869.80x = 5,088,476.38
  5. Step 5: Solve for x
    x = 5,088,476.38/1,869.80
  6. Step 6: Final answer
    x = 2,721.40

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1.5x scale

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.