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Finding the Fourth Proportional to 21,783.19, 30,069.99 and 14,719.18

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Solution

The fourth proportional to 21,783.19, 30,069.99 and 14,719.18 is: 20,318.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,783.19 : 30,069.99 = 14,719.18 : x
  2. Step 2: Convert to fraction form
    21,783.19/30,069.99 = 14,719.18/x
  3. Step 3: Cross multiply
    21,783.19x = 30,069.99 × 14,719.18
  4. Step 4: Simplify right side
    21,783.19x = 442,605,520.23
  5. Step 5: Solve for x
    x = 442,605,520.23/21,783.19
  6. Step 6: Final answer
    x = 20,318.68

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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.