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Finding the Fourth Proportional to 27,720.45, 41,580.68 and 21,159.45

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Solution

The fourth proportional to 27,720.45, 41,580.68 and 21,159.45 is: 31,739.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,720.45 : 41,580.68 = 21,159.45 : x
  2. Step 2: Convert to fraction form
    27,720.45/41,580.68 = 21,159.45/x
  3. Step 3: Cross multiply
    27,720.45x = 41,580.68 × 21,159.45
  4. Step 4: Simplify right side
    27,720.45x = 879,824,213.63
  5. Step 5: Solve for x
    x = 879,824,213.63/27,720.45
  6. Step 6: Final answer
    x = 31,739.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.