Home / 21,009.40-31,514.10-12,698.80

Finding the Fourth Proportional to 21,009.40, 31,514.10 and 12,698.80

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Solution

The fourth proportional to 21,009.40, 31,514.10 and 12,698.80 is: 19,048.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.40 : 31,514.10 = 12,698.80 : x
  2. Step 2: Convert to fraction form
    21,009.40/31,514.10 = 12,698.80/x
  3. Step 3: Cross multiply
    21,009.40x = 31,514.10 × 12,698.80
  4. Step 4: Simplify right side
    21,009.40x = 400,191,253.08
  5. Step 5: Solve for x
    x = 400,191,253.08/21,009.40
  6. Step 6: Final answer
    x = 19,048.20

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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.