Home / 21,215.60-31,857.40-16,869.20

Finding the Fourth Proportional to 21,215.60, 31,857.40 and 16,869.20

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Solution

The fourth proportional to 21,215.60, 31,857.40 and 16,869.20 is: 25,330.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.60 : 31,857.40 = 16,869.20 : x
  2. Step 2: Convert to fraction form
    21,215.60/31,857.40 = 16,869.20/x
  3. Step 3: Cross multiply
    21,215.60x = 31,857.40 × 16,869.20
  4. Step 4: Simplify right side
    21,215.60x = 537,408,852.08
  5. Step 5: Solve for x
    x = 537,408,852.08/21,215.60
  6. Step 6: Final answer
    x = 25,330.83

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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.