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Finding the Fourth Proportional to 12,728.58, 17,572.07 and 9,889.56

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Solution

The fourth proportional to 12,728.58, 17,572.07 and 9,889.56 is: 13,652.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,728.58 : 17,572.07 = 9,889.56 : x
  2. Step 2: Convert to fraction form
    12,728.58/17,572.07 = 9,889.56/x
  3. Step 3: Cross multiply
    12,728.58x = 17,572.07 × 9,889.56
  4. Step 4: Simplify right side
    12,728.58x = 173,779,903.28
  5. Step 5: Solve for x
    x = 173,779,903.28/12,728.58
  6. Step 6: Final answer
    x = 13,652.74

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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.