Home / 21,128.63-29,157.71-11,697.39

Finding the Fourth Proportional to 21,128.63, 29,157.71 and 11,697.39

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Solution

The fourth proportional to 21,128.63, 29,157.71 and 11,697.39 is: 16,142.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.63 : 29,157.71 = 11,697.39 : x
  2. Step 2: Convert to fraction form
    21,128.63/29,157.71 = 11,697.39/x
  3. Step 3: Cross multiply
    21,128.63x = 29,157.71 × 11,697.39
  4. Step 4: Simplify right side
    21,128.63x = 341,069,046.89
  5. Step 5: Solve for x
    x = 341,069,046.89/21,128.63
  6. Step 6: Final answer
    x = 16,142.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.