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Finding the Fourth Proportional to 15,640.84, 21,603.54 and 12,660.04

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Solution

The fourth proportional to 15,640.84, 21,603.54 and 12,660.04 is: 17,486.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,640.84 : 21,603.54 = 12,660.04 : x
  2. Step 2: Convert to fraction form
    15,640.84/21,603.54 = 12,660.04/x
  3. Step 3: Cross multiply
    15,640.84x = 21,603.54 × 12,660.04
  4. Step 4: Simplify right side
    15,640.84x = 273,501,680.54
  5. Step 5: Solve for x
    x = 273,501,680.54/15,640.84
  6. Step 6: Final answer
    x = 17,486.38

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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.