Home / 21,301.28-31,916.60-12,956.05

Finding the Fourth Proportional to 21,301.28, 31,916.60 and 12,956.05

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Solution

The fourth proportional to 21,301.28, 31,916.60 and 12,956.05 is: 19,412.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,301.28 : 31,916.60 = 12,956.05 : x
  2. Step 2: Convert to fraction form
    21,301.28/31,916.60 = 12,956.05/x
  3. Step 3: Cross multiply
    21,301.28x = 31,916.60 × 12,956.05
  4. Step 4: Simplify right side
    21,301.28x = 413,512,841.07
  5. Step 5: Solve for x
    x = 413,512,841.07/21,301.28
  6. Step 6: Final answer
    x = 19,412.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.