Home / 28,139.82-38,831.40-15,390.48

Finding the Fourth Proportional to 28,139.82, 38,831.40 and 15,390.48

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Solution

The fourth proportional to 28,139.82, 38,831.40 and 15,390.48 is: 21,238.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139.82 : 38,831.40 = 15,390.48 : x
  2. Step 2: Convert to fraction form
    28,139.82/38,831.40 = 15,390.48/x
  3. Step 3: Cross multiply
    28,139.82x = 38,831.40 × 15,390.48
  4. Step 4: Simplify right side
    28,139.82x = 597,633,885.07
  5. Step 5: Solve for x
    x = 597,633,885.07/28,139.82
  6. Step 6: Final answer
    x = 21,238.01

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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.