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Finding the Fourth Proportional to 28,700.80, 43,039.05 and 8,974.06

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Solution

The fourth proportional to 28,700.80, 43,039.05 and 8,974.06 is: 13,457.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,700.80 : 43,039.05 = 8,974.06 : x
  2. Step 2: Convert to fraction form
    28,700.80/43,039.05 = 8,974.06/x
  3. Step 3: Cross multiply
    28,700.80x = 43,039.05 × 8,974.06
  4. Step 4: Simplify right side
    28,700.80x = 386,235,017.04
  5. Step 5: Solve for x
    x = 386,235,017.04/28,700.80
  6. Step 6: Final answer
    x = 13,457.29

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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.