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Finding the Fourth Proportional to 60,429.60, 90,648.72 and 20,981.60

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Solution

The fourth proportional to 60,429.60, 90,648.72 and 20,981.60 is: 31,473.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,429.60 : 90,648.72 = 20,981.60 : x
  2. Step 2: Convert to fraction form
    60,429.60/90,648.72 = 20,981.60/x
  3. Step 3: Cross multiply
    60,429.60x = 90,648.72 × 20,981.60
  4. Step 4: Simplify right side
    60,429.60x = 1,901,955,183.55
  5. Step 5: Solve for x
    x = 1,901,955,183.55/60,429.60
  6. Step 6: Final answer
    x = 31,473.90

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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.