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Finding the Fourth Proportional to 70,143.60, 105,230.12 and 20,223.60

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Solution

The fourth proportional to 70,143.60, 105,230.12 and 20,223.60 is: 30,339.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,143.60 : 105,230.12 = 20,223.60 : x
  2. Step 2: Convert to fraction form
    70,143.60/105,230.12 = 20,223.60/x
  3. Step 3: Cross multiply
    70,143.60x = 105,230.12 × 20,223.60
  4. Step 4: Simplify right side
    70,143.60x = 2,128,131,854.83
  5. Step 5: Solve for x
    x = 2,128,131,854.83/70,143.60
  6. Step 6: Final answer
    x = 30,339.64

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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.