Home / 30,780.60-42,467.25-18,831.48

Finding the Fourth Proportional to 30,780.60, 42,467.25 and 18,831.48

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Solution

The fourth proportional to 30,780.60, 42,467.25 and 18,831.48 is: 25,981.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,780.60 : 42,467.25 = 18,831.48 : x
  2. Step 2: Convert to fraction form
    30,780.60/42,467.25 = 18,831.48/x
  3. Step 3: Cross multiply
    30,780.60x = 42,467.25 × 18,831.48
  4. Step 4: Simplify right side
    30,780.60x = 799,721,169.03
  5. Step 5: Solve for x
    x = 799,721,169.03/30,780.60
  6. Step 6: Final answer
    x = 25,981.34

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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.