Home / 21,203.90-31,805.85-12,900.20

Finding the Fourth Proportional to 21,203.90, 31,805.85 and 12,900.20

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Solution

The fourth proportional to 21,203.90, 31,805.85 and 12,900.20 is: 19,350.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,203.90 : 31,805.85 = 12,900.20 : x
  2. Step 2: Convert to fraction form
    21,203.90/31,805.85 = 12,900.20/x
  3. Step 3: Cross multiply
    21,203.90x = 31,805.85 × 12,900.20
  4. Step 4: Simplify right side
    21,203.90x = 410,301,826.17
  5. Step 5: Solve for x
    x = 410,301,826.17/21,203.90
  6. Step 6: Final answer
    x = 19,350.30

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1.5x scale

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.