Home / 21,121.60-31,670.60-8,650.32

Finding the Fourth Proportional to 21,121.60, 31,670.60 and 8,650.32

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Solution

The fourth proportional to 21,121.60, 31,670.60 and 8,650.32 is: 12,970.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.60 : 31,670.60 = 8,650.32 : x
  2. Step 2: Convert to fraction form
    21,121.60/31,670.60 = 8,650.32/x
  3. Step 3: Cross multiply
    21,121.60x = 31,670.60 × 8,650.32
  4. Step 4: Simplify right side
    21,121.60x = 273,960,824.59
  5. Step 5: Solve for x
    x = 273,960,824.59/21,121.60
  6. Step 6: Final answer
    x = 12,970.65

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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.