Home / 21,810.40-30,112.32-13,431.76

Finding the Fourth Proportional to 21,810.40, 30,112.32 and 13,431.76

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Solution

The fourth proportional to 21,810.40, 30,112.32 and 13,431.76 is: 18,544.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,810.40 : 30,112.32 = 13,431.76 : x
  2. Step 2: Convert to fraction form
    21,810.40/30,112.32 = 13,431.76/x
  3. Step 3: Cross multiply
    21,810.40x = 30,112.32 × 13,431.76
  4. Step 4: Simplify right side
    21,810.40x = 404,461,455.28
  5. Step 5: Solve for x
    x = 404,461,455.28/21,810.40
  6. Step 6: Final answer
    x = 18,544.43

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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.