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Finding the Fourth Proportional to 18,847.95, 25,999.29 and 15,642.93

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Solution

The fourth proportional to 18,847.95, 25,999.29 and 15,642.93 is: 21,578.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,847.95 : 25,999.29 = 15,642.93 : x
  2. Step 2: Convert to fraction form
    18,847.95/25,999.29 = 15,642.93/x
  3. Step 3: Cross multiply
    18,847.95x = 25,999.29 × 15,642.93
  4. Step 4: Simplify right side
    18,847.95x = 406,705,073.52
  5. Step 5: Solve for x
    x = 406,705,073.52/18,847.95
  6. Step 6: Final answer
    x = 21,578.21

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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.