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Finding the Fourth Proportional to 18,871.95, 28,318.86 and 7,776.57

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Solution

The fourth proportional to 18,871.95, 28,318.86 and 7,776.57 is: 11,669.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.95 : 28,318.86 = 7,776.57 : x
  2. Step 2: Convert to fraction form
    18,871.95/28,318.86 = 7,776.57/x
  3. Step 3: Cross multiply
    18,871.95x = 28,318.86 × 7,776.57
  4. Step 4: Simplify right side
    18,871.95x = 220,223,597.11
  5. Step 5: Solve for x
    x = 220,223,597.11/18,871.95
  6. Step 6: Final answer
    x = 11,669.36

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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.