Home / 20,688.40-31,040.70-8,206.30

Finding the Fourth Proportional to 20,688.40, 31,040.70 and 8,206.30

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Solution

The fourth proportional to 20,688.40, 31,040.70 and 8,206.30 is: 12,312.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.40 : 31,040.70 = 8,206.30 : x
  2. Step 2: Convert to fraction form
    20,688.40/31,040.70 = 8,206.30/x
  3. Step 3: Cross multiply
    20,688.40x = 31,040.70 × 8,206.30
  4. Step 4: Simplify right side
    20,688.40x = 254,729,296.41
  5. Step 5: Solve for x
    x = 254,729,296.41/20,688.40
  6. Step 6: Final answer
    x = 12,312.66

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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.