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Finding the Fourth Proportional to 28,540.30, 42,810.45 and 9,820.79

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Solution

The fourth proportional to 28,540.30, 42,810.45 and 9,820.79 is: 14,731.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,540.30 : 42,810.45 = 9,820.79 : x
  2. Step 2: Convert to fraction form
    28,540.30/42,810.45 = 9,820.79/x
  3. Step 3: Cross multiply
    28,540.30x = 42,810.45 × 9,820.79
  4. Step 4: Simplify right side
    28,540.30x = 420,432,439.26
  5. Step 5: Solve for x
    x = 420,432,439.26/28,540.30
  6. Step 6: Final answer
    x = 14,731.19

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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.