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Finding the Fourth Proportional to 15,681.69, 21,640.84 and 8,511.62

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Solution

The fourth proportional to 15,681.69, 21,640.84 and 8,511.62 is: 11,746.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.69 : 21,640.84 = 8,511.62 : x
  2. Step 2: Convert to fraction form
    15,681.69/21,640.84 = 8,511.62/x
  3. Step 3: Cross multiply
    15,681.69x = 21,640.84 × 8,511.62
  4. Step 4: Simplify right side
    15,681.69x = 184,198,477.08
  5. Step 5: Solve for x
    x = 184,198,477.08/15,681.69
  6. Step 6: Final answer
    x = 11,746.09

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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.