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Finding the Fourth Proportional to 28,425.96, 42,639.12 and 8,703

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Solution

The fourth proportional to 28,425.96, 42,639.12 and 8,703 is: 13,054.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,425.96 : 42,639.12 = 8,703 : x
  2. Step 2: Convert to fraction form
    28,425.96/42,639.12 = 8,703/x
  3. Step 3: Cross multiply
    28,425.96x = 42,639.12 × 8,703
  4. Step 4: Simplify right side
    28,425.96x = 371,088,261.36
  5. Step 5: Solve for x
    x = 371,088,261.36/28,425.96
  6. Step 6: Final answer
    x = 13,054.56

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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.