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Finding the Fourth Proportional to 38,688.21, 53,389.71 and 21,921.21

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Solution

The fourth proportional to 38,688.21, 53,389.71 and 21,921.21 is: 30,251.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,688.21 : 53,389.71 = 21,921.21 : x
  2. Step 2: Convert to fraction form
    38,688.21/53,389.71 = 21,921.21/x
  3. Step 3: Cross multiply
    38,688.21x = 53,389.71 × 21,921.21
  4. Step 4: Simplify right side
    38,688.21x = 1,170,367,044.75
  5. Step 5: Solve for x
    x = 1,170,367,044.75/38,688.21
  6. Step 6: Final answer
    x = 30,251.26

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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.