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Finding the Fourth Proportional to 28,013.60, 42,020.40 and 8,295.20

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Solution

The fourth proportional to 28,013.60, 42,020.40 and 8,295.20 is: 12,442.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,013.60 : 42,020.40 = 8,295.20 : x
  2. Step 2: Convert to fraction form
    28,013.60/42,020.40 = 8,295.20/x
  3. Step 3: Cross multiply
    28,013.60x = 42,020.40 × 8,295.20
  4. Step 4: Simplify right side
    28,013.60x = 348,567,622.08
  5. Step 5: Solve for x
    x = 348,567,622.08/28,013.60
  6. Step 6: Final answer
    x = 12,442.80

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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.