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Finding the Fourth Proportional to 1,871.61, 2,808.42 and 1,328.28

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Solution

The fourth proportional to 1,871.61, 2,808.42 and 1,328.28 is: 1,993.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.61 : 2,808.42 = 1,328.28 : x
  2. Step 2: Convert to fraction form
    1,871.61/2,808.42 = 1,328.28/x
  3. Step 3: Cross multiply
    1,871.61x = 2,808.42 × 1,328.28
  4. Step 4: Simplify right side
    1,871.61x = 3,730,368.12
  5. Step 5: Solve for x
    x = 3,730,368.12/1,871.61
  6. Step 6: Final answer
    x = 1,993.13

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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.