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Finding the Fourth Proportional to 15,638.32, 21,580.48 and 8,739.54

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Solution

The fourth proportional to 15,638.32, 21,580.48 and 8,739.54 is: 12,060.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,638.32 : 21,580.48 = 8,739.54 : x
  2. Step 2: Convert to fraction form
    15,638.32/21,580.48 = 8,739.54/x
  3. Step 3: Cross multiply
    15,638.32x = 21,580.48 × 8,739.54
  4. Step 4: Simplify right side
    15,638.32x = 188,603,468.18
  5. Step 5: Solve for x
    x = 188,603,468.18/15,638.32
  6. Step 6: Final answer
    x = 12,060.34

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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.