Home / 31,215.12-43,113.81-21,126.06

Finding the Fourth Proportional to 31,215.12, 43,113.81 and 21,126.06

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Solution

The fourth proportional to 31,215.12, 43,113.81 and 21,126.06 is: 29,178.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,215.12 : 43,113.81 = 21,126.06 : x
  2. Step 2: Convert to fraction form
    31,215.12/43,113.81 = 21,126.06/x
  3. Step 3: Cross multiply
    31,215.12x = 43,113.81 × 21,126.06
  4. Step 4: Simplify right side
    31,215.12x = 910,824,936.89
  5. Step 5: Solve for x
    x = 910,824,936.89/31,215.12
  6. Step 6: Final answer
    x = 29,178.97

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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.