Home / 21,139.95-31,714.59-7,992.45

Finding the Fourth Proportional to 21,139.95, 31,714.59 and 7,992.45

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Solution

The fourth proportional to 21,139.95, 31,714.59 and 7,992.45 is: 11,990.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.95 : 31,714.59 = 7,992.45 : x
  2. Step 2: Convert to fraction form
    21,139.95/31,714.59 = 7,992.45/x
  3. Step 3: Cross multiply
    21,139.95x = 31,714.59 × 7,992.45
  4. Step 4: Simplify right side
    21,139.95x = 253,477,274.85
  5. Step 5: Solve for x
    x = 253,477,274.85/21,139.95
  6. Step 6: Final answer
    x = 11,990.44

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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.