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Finding the Fourth Proportional to 18,759.78, 28,117.68 and 10,435.86

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Solution

The fourth proportional to 18,759.78, 28,117.68 and 10,435.86 is: 15,641.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759.78 : 28,117.68 = 10,435.86 : x
  2. Step 2: Convert to fraction form
    18,759.78/28,117.68 = 10,435.86/x
  3. Step 3: Cross multiply
    18,759.78x = 28,117.68 × 10,435.86
  4. Step 4: Simplify right side
    18,759.78x = 293,432,172.00
  5. Step 5: Solve for x
    x = 293,432,172.00/18,759.78
  6. Step 6: Final answer
    x = 15,641.56

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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.