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Finding the Fourth Proportional to 28,378.44, 42,570.12 and 8,657.22

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Solution

The fourth proportional to 28,378.44, 42,570.12 and 8,657.22 is: 12,986.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,378.44 : 42,570.12 = 8,657.22 : x
  2. Step 2: Convert to fraction form
    28,378.44/42,570.12 = 8,657.22/x
  3. Step 3: Cross multiply
    28,378.44x = 42,570.12 × 8,657.22
  4. Step 4: Simplify right side
    28,378.44x = 368,538,894.27
  5. Step 5: Solve for x
    x = 368,538,894.27/28,378.44
  6. Step 6: Final answer
    x = 12,986.58

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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.