Home / 21,017.76-31,481.40-9,907.80

Finding the Fourth Proportional to 21,017.76, 31,481.40 and 9,907.80

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Solution

The fourth proportional to 21,017.76, 31,481.40 and 9,907.80 is: 14,840.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,017.76 : 31,481.40 = 9,907.80 : x
  2. Step 2: Convert to fraction form
    21,017.76/31,481.40 = 9,907.80/x
  3. Step 3: Cross multiply
    21,017.76x = 31,481.40 × 9,907.80
  4. Step 4: Simplify right side
    21,017.76x = 311,911,414.92
  5. Step 5: Solve for x
    x = 311,911,414.92/21,017.76
  6. Step 6: Final answer
    x = 14,840.37

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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.