Home / 21,113.96-29,139.30-12,730.28

Finding the Fourth Proportional to 21,113.96, 29,139.30 and 12,730.28

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Solution

The fourth proportional to 21,113.96, 29,139.30 and 12,730.28 is: 17,569.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,113.96 : 29,139.30 = 12,730.28 : x
  2. Step 2: Convert to fraction form
    21,113.96/29,139.30 = 12,730.28/x
  3. Step 3: Cross multiply
    21,113.96x = 29,139.30 × 12,730.28
  4. Step 4: Simplify right side
    21,113.96x = 370,951,448.00
  5. Step 5: Solve for x
    x = 370,951,448.00/21,113.96
  6. Step 6: Final answer
    x = 17,569.01

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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.