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Finding the Fourth Proportional to 15,355, 21,189.99 and 8,640.74

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Solution

The fourth proportional to 15,355, 21,189.99 and 8,640.74 is: 11,924.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,355 : 21,189.99 = 8,640.74 : x
  2. Step 2: Convert to fraction form
    15,355/21,189.99 = 8,640.74/x
  3. Step 3: Cross multiply
    15,355x = 21,189.99 × 8,640.74
  4. Step 4: Simplify right side
    15,355x = 183,097,194.19
  5. Step 5: Solve for x
    x = 183,097,194.19/15,355
  6. Step 6: Final answer
    x = 11,924.27

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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.