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Finding the Fourth Proportional to 1,871.91, 2,807.18 and 638.99

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Solution

The fourth proportional to 1,871.91, 2,807.18 and 638.99 is: 958.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.91 : 2,807.18 = 638.99 : x
  2. Step 2: Convert to fraction form
    1,871.91/2,807.18 = 638.99/x
  3. Step 3: Cross multiply
    1,871.91x = 2,807.18 × 638.99
  4. Step 4: Simplify right side
    1,871.91x = 1,793,757.44
  5. Step 5: Solve for x
    x = 1,793,757.44/1,871.91
  6. Step 6: Final answer
    x = 958.25

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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.