Home / 13,881.40-20,831.70-9,988.60

Finding the Fourth Proportional to 13,881.40, 20,831.70 and 9,988.60

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Solution

The fourth proportional to 13,881.40, 20,831.70 and 9,988.60 is: 14,989.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,881.40 : 20,831.70 = 9,988.60 : x
  2. Step 2: Convert to fraction form
    13,881.40/20,831.70 = 9,988.60/x
  3. Step 3: Cross multiply
    13,881.40x = 20,831.70 × 9,988.60
  4. Step 4: Simplify right side
    13,881.40x = 208,079,518.62
  5. Step 5: Solve for x
    x = 208,079,518.62/13,881.40
  6. Step 6: Final answer
    x = 14,989.81

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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.