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Finding the Fourth Proportional to 18,751.77, 28,115.10 and 7,655.45

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Solution

The fourth proportional to 18,751.77, 28,115.10 and 7,655.45 is: 11,478.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.77 : 28,115.10 = 7,655.45 : x
  2. Step 2: Convert to fraction form
    18,751.77/28,115.10 = 7,655.45/x
  3. Step 3: Cross multiply
    18,751.77x = 28,115.10 × 7,655.45
  4. Step 4: Simplify right side
    18,751.77x = 215,233,601.72
  5. Step 5: Solve for x
    x = 215,233,601.72/18,751.77
  6. Step 6: Final answer
    x = 11,478.04

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1.5x scale

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.