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Finding the Fourth Proportional to 21,200.53, 31,801.05 and 5,405.53

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Solution

The fourth proportional to 21,200.53, 31,801.05 and 5,405.53 is: 8,108.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,200.53 : 31,801.05 = 5,405.53 : x
  2. Step 2: Convert to fraction form
    21,200.53/31,801.05 = 5,405.53/x
  3. Step 3: Cross multiply
    21,200.53x = 31,801.05 × 5,405.53
  4. Step 4: Simplify right side
    21,200.53x = 171,901,529.81
  5. Step 5: Solve for x
    x = 171,901,529.81/21,200.53
  6. Step 6: Final answer
    x = 8,108.36

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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.