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Finding the Fourth Proportional to 18,921.65, 28,403.99 and 9,572.23

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Solution

The fourth proportional to 18,921.65, 28,403.99 and 9,572.23 is: 14,369.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.65 : 28,403.99 = 9,572.23 : x
  2. Step 2: Convert to fraction form
    18,921.65/28,403.99 = 9,572.23/x
  3. Step 3: Cross multiply
    18,921.65x = 28,403.99 × 9,572.23
  4. Step 4: Simplify right side
    18,921.65x = 271,889,415.89
  5. Step 5: Solve for x
    x = 271,889,415.89/18,921.65
  6. Step 6: Final answer
    x = 14,369.22

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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.