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Finding the Fourth Proportional to 28,122.64, 42,190.02 and 8,402.80

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Solution

The fourth proportional to 28,122.64, 42,190.02 and 8,402.80 is: 12,606.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,122.64 : 42,190.02 = 8,402.80 : x
  2. Step 2: Convert to fraction form
    28,122.64/42,190.02 = 8,402.80/x
  3. Step 3: Cross multiply
    28,122.64x = 42,190.02 × 8,402.80
  4. Step 4: Simplify right side
    28,122.64x = 354,514,300.06
  5. Step 5: Solve for x
    x = 354,514,300.06/28,122.64
  6. Step 6: Final answer
    x = 12,606.01

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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.