Home / 20,749.81-31,132.58-12,435.80

Finding the Fourth Proportional to 20,749.81, 31,132.58 and 12,435.80

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Solution

The fourth proportional to 20,749.81, 31,132.58 and 12,435.80 is: 18,658.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,749.81 : 31,132.58 = 12,435.80 : x
  2. Step 2: Convert to fraction form
    20,749.81/31,132.58 = 12,435.80/x
  3. Step 3: Cross multiply
    20,749.81x = 31,132.58 × 12,435.80
  4. Step 4: Simplify right side
    20,749.81x = 387,158,390.47
  5. Step 5: Solve for x
    x = 387,158,390.47/20,749.81
  6. Step 6: Final answer
    x = 18,658.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.