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Finding the Fourth Proportional to 21,385.71, 29,513.88 and 11,953.71

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Solution

The fourth proportional to 21,385.71, 29,513.88 and 11,953.71 is: 16,497.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,385.71 : 29,513.88 = 11,953.71 : x
  2. Step 2: Convert to fraction form
    21,385.71/29,513.88 = 11,953.71/x
  3. Step 3: Cross multiply
    21,385.71x = 29,513.88 × 11,953.71
  4. Step 4: Simplify right side
    21,385.71x = 352,800,362.49
  5. Step 5: Solve for x
    x = 352,800,362.49/21,385.71
  6. Step 6: Final answer
    x = 16,497.01

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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.