Home / 21,279.02-31,920.72-8,142.44

Finding the Fourth Proportional to 21,279.02, 31,920.72 and 8,142.44

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Solution

The fourth proportional to 21,279.02, 31,920.72 and 8,142.44 is: 12,214.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.02 : 31,920.72 = 8,142.44 : x
  2. Step 2: Convert to fraction form
    21,279.02/31,920.72 = 8,142.44/x
  3. Step 3: Cross multiply
    21,279.02x = 31,920.72 × 8,142.44
  4. Step 4: Simplify right side
    21,279.02x = 259,912,547.36
  5. Step 5: Solve for x
    x = 259,912,547.36/21,279.02
  6. Step 6: Final answer
    x = 12,214.50

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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.