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Finding the Fourth Proportional to 28,420.86, 42,631.36 and 8,699.34

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Solution

The fourth proportional to 28,420.86, 42,631.36 and 8,699.34 is: 13,049.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.86 : 42,631.36 = 8,699.34 : x
  2. Step 2: Convert to fraction form
    28,420.86/42,631.36 = 8,699.34/x
  3. Step 3: Cross multiply
    28,420.86x = 42,631.36 × 8,699.34
  4. Step 4: Simplify right side
    28,420.86x = 370,864,695.30
  5. Step 5: Solve for x
    x = 370,864,695.30/28,420.86
  6. Step 6: Final answer
    x = 13,049.03

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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.