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Finding the Fourth Proportional to 1,871.40, 2,807.11 and 572.87

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Solution

The fourth proportional to 1,871.40, 2,807.11 and 572.87 is: 859.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.40 : 2,807.11 = 572.87 : x
  2. Step 2: Convert to fraction form
    1,871.40/2,807.11 = 572.87/x
  3. Step 3: Cross multiply
    1,871.40x = 2,807.11 × 572.87
  4. Step 4: Simplify right side
    1,871.40x = 1,608,109.11
  5. Step 5: Solve for x
    x = 1,608,109.11/1,871.40
  6. Step 6: Final answer
    x = 859.31

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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.