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Finding the Fourth Proportional to 28,124.80, 42,187.70 and 8,403.60

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Solution

The fourth proportional to 28,124.80, 42,187.70 and 8,403.60 is: 12,605.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,124.80 : 42,187.70 = 8,403.60 : x
  2. Step 2: Convert to fraction form
    28,124.80/42,187.70 = 8,403.60/x
  3. Step 3: Cross multiply
    28,124.80x = 42,187.70 × 8,403.60
  4. Step 4: Simplify right side
    28,124.80x = 354,528,555.72
  5. Step 5: Solve for x
    x = 354,528,555.72/28,124.80
  6. Step 6: Final answer
    x = 12,605.55

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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.