Home / 20,808.30-31,212.45-12,497.70

Finding the Fourth Proportional to 20,808.30, 31,212.45 and 12,497.70

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Solution

The fourth proportional to 20,808.30, 31,212.45 and 12,497.70 is: 18,746.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.30 : 31,212.45 = 12,497.70 : x
  2. Step 2: Convert to fraction form
    20,808.30/31,212.45 = 12,497.70/x
  3. Step 3: Cross multiply
    20,808.30x = 31,212.45 × 12,497.70
  4. Step 4: Simplify right side
    20,808.30x = 390,083,836.37
  5. Step 5: Solve for x
    x = 390,083,836.37/20,808.30
  6. Step 6: Final answer
    x = 18,746.55

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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.