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Finding the Fourth Proportional to 19,657.84, 27,128.16 and 11,159.74

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Solution

The fourth proportional to 19,657.84, 27,128.16 and 11,159.74 is: 15,400.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,657.84 : 27,128.16 = 11,159.74 : x
  2. Step 2: Convert to fraction form
    19,657.84/27,128.16 = 11,159.74/x
  3. Step 3: Cross multiply
    19,657.84x = 27,128.16 × 11,159.74
  4. Step 4: Simplify right side
    19,657.84x = 302,743,212.28
  5. Step 5: Solve for x
    x = 302,743,212.28/19,657.84
  6. Step 6: Final answer
    x = 15,400.63

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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.