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Finding the Fourth Proportional to 28,699.80, 39,511.85 and 22,638.98

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Solution

The fourth proportional to 28,699.80, 39,511.85 and 22,638.98 is: 31,167.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,699.80 : 39,511.85 = 22,638.98 : x
  2. Step 2: Convert to fraction form
    28,699.80/39,511.85 = 22,638.98/x
  3. Step 3: Cross multiply
    28,699.80x = 39,511.85 × 22,638.98
  4. Step 4: Simplify right side
    28,699.80x = 894,507,671.16
  5. Step 5: Solve for x
    x = 894,507,671.16/28,699.80
  6. Step 6: Final answer
    x = 31,167.73

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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.