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Finding the Fourth Proportional to 21,554.97, 29,740.95 and 12,478.92

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Solution

The fourth proportional to 21,554.97, 29,740.95 and 12,478.92 is: 17,218.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,554.97 : 29,740.95 = 12,478.92 : x
  2. Step 2: Convert to fraction form
    21,554.97/29,740.95 = 12,478.92/x
  3. Step 3: Cross multiply
    21,554.97x = 29,740.95 × 12,478.92
  4. Step 4: Simplify right side
    21,554.97x = 371,134,935.77
  5. Step 5: Solve for x
    x = 371,134,935.77/21,554.97
  6. Step 6: Final answer
    x = 17,218.07

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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.