Home / 21,128.92-29,152.38-12,739.48

Finding the Fourth Proportional to 21,128.92, 29,152.38 and 12,739.48

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Solution

The fourth proportional to 21,128.92, 29,152.38 and 12,739.48 is: 17,577.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.92 : 29,152.38 = 12,739.48 : x
  2. Step 2: Convert to fraction form
    21,128.92/29,152.38 = 12,739.48/x
  3. Step 3: Cross multiply
    21,128.92x = 29,152.38 × 12,739.48
  4. Step 4: Simplify right side
    21,128.92x = 371,386,161.96
  5. Step 5: Solve for x
    x = 371,386,161.96/21,128.92
  6. Step 6: Final answer
    x = 17,577.15

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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.