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Finding the Fourth Proportional to 28,407, 39,201.84 and 15,831.84

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Solution

The fourth proportional to 28,407, 39,201.84 and 15,831.84 is: 21,848.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,407 : 39,201.84 = 15,831.84 : x
  2. Step 2: Convert to fraction form
    28,407/39,201.84 = 15,831.84/x
  3. Step 3: Cross multiply
    28,407x = 39,201.84 × 15,831.84
  4. Step 4: Simplify right side
    28,407x = 620,637,258.59
  5. Step 5: Solve for x
    x = 620,637,258.59/28,407
  6. Step 6: Final answer
    x = 21,848.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.