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Finding the Fourth Proportional to 11,235.72, 16,868.16 and 8,640.48

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Solution

The fourth proportional to 11,235.72, 16,868.16 and 8,640.48 is: 12,971.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,235.72 : 16,868.16 = 8,640.48 : x
  2. Step 2: Convert to fraction form
    11,235.72/16,868.16 = 8,640.48/x
  3. Step 3: Cross multiply
    11,235.72x = 16,868.16 × 8,640.48
  4. Step 4: Simplify right side
    11,235.72x = 145,748,999.12
  5. Step 5: Solve for x
    x = 145,748,999.12/11,235.72
  6. Step 6: Final answer
    x = 12,971.93

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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.