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Finding the Fourth Proportional to 28,407.81, 42,611.49 and 8,418.63

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Solution

The fourth proportional to 28,407.81, 42,611.49 and 8,418.63 is: 12,627.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407.81 : 42,611.49 = 8,418.63 : x
  2. Step 2: Convert to fraction form
    28,407.81/42,611.49 = 8,418.63/x
  3. Step 3: Cross multiply
    28,407.81x = 42,611.49 × 8,418.63
  4. Step 4: Simplify right side
    28,407.81x = 358,730,325.97
  5. Step 5: Solve for x
    x = 358,730,325.97/28,407.81
  6. Step 6: Final answer
    x = 12,627.88

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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.