Home / 28,280.78-39,029.21-15,705.53

Finding the Fourth Proportional to 28,280.78, 39,029.21 and 15,705.53

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Solution

The fourth proportional to 28,280.78, 39,029.21 and 15,705.53 is: 21,674.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,280.78 : 39,029.21 = 15,705.53 : x
  2. Step 2: Convert to fraction form
    28,280.78/39,029.21 = 15,705.53/x
  3. Step 3: Cross multiply
    28,280.78x = 39,029.21 × 15,705.53
  4. Step 4: Simplify right side
    28,280.78x = 612,974,154.86
  5. Step 5: Solve for x
    x = 612,974,154.86/28,280.78
  6. Step 6: Final answer
    x = 21,674.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.