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Finding the Fourth Proportional to 28,711.40, 43,048.40 and 9,990

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Solution

The fourth proportional to 28,711.40, 43,048.40 and 9,990 is: 14,978.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,711.40 : 43,048.40 = 9,990 : x
  2. Step 2: Convert to fraction form
    28,711.40/43,048.40 = 9,990/x
  3. Step 3: Cross multiply
    28,711.40x = 43,048.40 × 9,990
  4. Step 4: Simplify right side
    28,711.40x = 430,053,466.05
  5. Step 5: Solve for x
    x = 430,053,466.05/28,711.40
  6. Step 6: Final answer
    x = 14,978.49

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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.