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Finding the Fourth Proportional to 142,448.80, 213,673.20 and 68,720.80

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Solution

The fourth proportional to 142,448.80, 213,673.20 and 68,720.80 is: 103,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,448.80 : 213,673.20 = 68,720.80 : x
  2. Step 2: Convert to fraction form
    142,448.80/213,673.20 = 68,720.80/x
  3. Step 3: Cross multiply
    142,448.80x = 213,673.20 × 68,720.80
  4. Step 4: Simplify right side
    142,448.80x = 14,683,793,242.56
  5. Step 5: Solve for x
    x = 14,683,793,242.56/142,448.80
  6. Step 6: Final answer
    x = 103,081.20

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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.