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Finding the Fourth Proportional to 1,871.84, 2,806.95 and 638.92

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Solution

The fourth proportional to 1,871.84, 2,806.95 and 638.92 is: 958.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,871.84 : 2,806.95 = 638.92 : x
  2. Step 2: Convert to fraction form
    1,871.84/2,806.95 = 638.92/x
  3. Step 3: Cross multiply
    1,871.84x = 2,806.95 × 638.92
  4. Step 4: Simplify right side
    1,871.84x = 1,793,422.40
  5. Step 5: Solve for x
    x = 1,793,422.40/1,871.84
  6. Step 6: Final answer
    x = 958.11

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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.