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Finding the Fourth Proportional to 45,779.20, 68,668.80 and 20,831.20

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Solution

The fourth proportional to 45,779.20, 68,668.80 and 20,831.20 is: 31,246.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,779.20 : 68,668.80 = 20,831.20 : x
  2. Step 2: Convert to fraction form
    45,779.20/68,668.80 = 20,831.20/x
  3. Step 3: Cross multiply
    45,779.20x = 68,668.80 × 20,831.20
  4. Step 4: Simplify right side
    45,779.20x = 1,430,453,506.56
  5. Step 5: Solve for x
    x = 1,430,453,506.56/45,779.20
  6. Step 6: Final answer
    x = 31,246.80

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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.