Home / 28,531.20-42,777.60-12,940.80

Finding the Fourth Proportional to 28,531.20, 42,777.60 and 12,940.80

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Solution

The fourth proportional to 28,531.20, 42,777.60 and 12,940.80 is: 19,402.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,531.20 : 42,777.60 = 12,940.80 : x
  2. Step 2: Convert to fraction form
    28,531.20/42,777.60 = 12,940.80/x
  3. Step 3: Cross multiply
    28,531.20x = 42,777.60 × 12,940.80
  4. Step 4: Simplify right side
    28,531.20x = 553,576,366.08
  5. Step 5: Solve for x
    x = 553,576,366.08/28,531.20
  6. Step 6: Final answer
    x = 19,402.49

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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.