Home / 21,204.72-29,264.40-15,890.40

Finding the Fourth Proportional to 21,204.72, 29,264.40 and 15,890.40

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Solution

The fourth proportional to 21,204.72, 29,264.40 and 15,890.40 is: 21,930.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,204.72 : 29,264.40 = 15,890.40 : x
  2. Step 2: Convert to fraction form
    21,204.72/29,264.40 = 15,890.40/x
  3. Step 3: Cross multiply
    21,204.72x = 29,264.40 × 15,890.40
  4. Step 4: Simplify right side
    21,204.72x = 465,023,021.76
  5. Step 5: Solve for x
    x = 465,023,021.76/21,204.72
  6. Step 6: Final answer
    x = 21,930.17

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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.