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Finding the Fourth Proportional to 21,295.44, 31,953.08 and 8,143.48

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Solution

The fourth proportional to 21,295.44, 31,953.08 and 8,143.48 is: 12,219.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,295.44 : 31,953.08 = 8,143.48 : x
  2. Step 2: Convert to fraction form
    21,295.44/31,953.08 = 8,143.48/x
  3. Step 3: Cross multiply
    21,295.44x = 31,953.08 × 8,143.48
  4. Step 4: Simplify right side
    21,295.44x = 260,209,267.92
  5. Step 5: Solve for x
    x = 260,209,267.92/21,295.44
  6. Step 6: Final answer
    x = 12,219.01

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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.