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Finding the Fourth Proportional to 28,425.48, 42,640.38 and 8,705.49

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Solution

The fourth proportional to 28,425.48, 42,640.38 and 8,705.49 is: 13,058.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,425.48 : 42,640.38 = 8,705.49 : x
  2. Step 2: Convert to fraction form
    28,425.48/42,640.38 = 8,705.49/x
  3. Step 3: Cross multiply
    28,425.48x = 42,640.38 × 8,705.49
  4. Step 4: Simplify right side
    28,425.48x = 371,205,401.69
  5. Step 5: Solve for x
    x = 371,205,401.69/28,425.48
  6. Step 6: Final answer
    x = 13,058.90

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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.