Home / 21,008.40-31,511.70-7,860.84

Finding the Fourth Proportional to 21,008.40, 31,511.70 and 7,860.84

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Solution

The fourth proportional to 21,008.40, 31,511.70 and 7,860.84 is: 11,790.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.40 : 31,511.70 = 7,860.84 : x
  2. Step 2: Convert to fraction form
    21,008.40/31,511.70 = 7,860.84/x
  3. Step 3: Cross multiply
    21,008.40x = 31,511.70 × 7,860.84
  4. Step 4: Simplify right side
    21,008.40x = 247,708,431.83
  5. Step 5: Solve for x
    x = 247,708,431.83/21,008.40
  6. Step 6: Final answer
    x = 11,790.92

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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.