Home / 21,006.40-31,508.70-7,858.84

Finding the Fourth Proportional to 21,006.40, 31,508.70 and 7,858.84

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Solution

The fourth proportional to 21,006.40, 31,508.70 and 7,858.84 is: 11,787.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.40 : 31,508.70 = 7,858.84 : x
  2. Step 2: Convert to fraction form
    21,006.40/31,508.70 = 7,858.84/x
  3. Step 3: Cross multiply
    21,006.40x = 31,508.70 × 7,858.84
  4. Step 4: Simplify right side
    21,006.40x = 247,621,831.91
  5. Step 5: Solve for x
    x = 247,621,831.91/21,006.40
  6. Step 6: Final answer
    x = 11,787.92

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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.