Home / 28,139.95-38,831.50-15,390.75

Finding the Fourth Proportional to 28,139.95, 38,831.50 and 15,390.75

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Solution

The fourth proportional to 28,139.95, 38,831.50 and 15,390.75 is: 21,238.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139.95 : 38,831.50 = 15,390.75 : x
  2. Step 2: Convert to fraction form
    28,139.95/38,831.50 = 15,390.75/x
  3. Step 3: Cross multiply
    28,139.95x = 38,831.50 × 15,390.75
  4. Step 4: Simplify right side
    28,139.95x = 597,645,908.63
  5. Step 5: Solve for x
    x = 597,645,908.63/28,139.95
  6. Step 6: Final answer
    x = 21,238.34

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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.