Home / 13,831.72-20,768.28-7,915.28

Finding the Fourth Proportional to 13,831.72, 20,768.28 and 7,915.28

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Solution

The fourth proportional to 13,831.72, 20,768.28 and 7,915.28 is: 11,884.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,831.72 : 20,768.28 = 7,915.28 : x
  2. Step 2: Convert to fraction form
    13,831.72/20,768.28 = 7,915.28/x
  3. Step 3: Cross multiply
    13,831.72x = 20,768.28 × 7,915.28
  4. Step 4: Simplify right side
    13,831.72x = 164,386,751.32
  5. Step 5: Solve for x
    x = 164,386,751.32/13,831.72
  6. Step 6: Final answer
    x = 11,884.77

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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.