Home / 20,831.58-28,739.40-12,859.98

Finding the Fourth Proportional to 20,831.58, 28,739.40 and 12,859.98

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Solution

The fourth proportional to 20,831.58, 28,739.40 and 12,859.98 is: 17,741.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.58 : 28,739.40 = 12,859.98 : x
  2. Step 2: Convert to fraction form
    20,831.58/28,739.40 = 12,859.98/x
  3. Step 3: Cross multiply
    20,831.58x = 28,739.40 × 12,859.98
  4. Step 4: Simplify right side
    20,831.58x = 369,588,109.21
  5. Step 5: Solve for x
    x = 369,588,109.21/20,831.58
  6. Step 6: Final answer
    x = 17,741.72

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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.