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Finding the Fourth Proportional to 28,906.25, 39,890.63 and 15,658.25

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Solution

The fourth proportional to 28,906.25, 39,890.63 and 15,658.25 is: 21,608.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,906.25 : 39,890.63 = 15,658.25 : x
  2. Step 2: Convert to fraction form
    28,906.25/39,890.63 = 15,658.25/x
  3. Step 3: Cross multiply
    28,906.25x = 39,890.63 × 15,658.25
  4. Step 4: Simplify right side
    28,906.25x = 624,617,457.20
  5. Step 5: Solve for x
    x = 624,617,457.20/28,906.25
  6. Step 6: Final answer
    x = 21,608.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.