Home / 12,210.40-18,315.60-7,220.80

Finding the Fourth Proportional to 12,210.40, 18,315.60 and 7,220.80

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Solution

The fourth proportional to 12,210.40, 18,315.60 and 7,220.80 is: 10,831.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,210.40 : 18,315.60 = 7,220.80 : x
  2. Step 2: Convert to fraction form
    12,210.40/18,315.60 = 7,220.80/x
  3. Step 3: Cross multiply
    12,210.40x = 18,315.60 × 7,220.80
  4. Step 4: Simplify right side
    12,210.40x = 132,253,284.48
  5. Step 5: Solve for x
    x = 132,253,284.48/12,210.40
  6. Step 6: Final answer
    x = 10,831.20

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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.