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Finding the Fourth Proportional to 28,139.68, 42,203.24 and 8,415.68

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Solution

The fourth proportional to 28,139.68, 42,203.24 and 8,415.68 is: 12,621.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139.68 : 42,203.24 = 8,415.68 : x
  2. Step 2: Convert to fraction form
    28,139.68/42,203.24 = 8,415.68/x
  3. Step 3: Cross multiply
    28,139.68x = 42,203.24 × 8,415.68
  4. Step 4: Simplify right side
    28,139.68x = 355,168,709.71
  5. Step 5: Solve for x
    x = 355,168,709.71/28,139.68
  6. Step 6: Final answer
    x = 12,621.63

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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.