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Finding the Fourth Proportional to 18,989.55, 28,501.74 and 9,636.21

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Solution

The fourth proportional to 18,989.55, 28,501.74 and 9,636.21 is: 14,463.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.55 : 28,501.74 = 9,636.21 : x
  2. Step 2: Convert to fraction form
    18,989.55/28,501.74 = 9,636.21/x
  3. Step 3: Cross multiply
    18,989.55x = 28,501.74 × 9,636.21
  4. Step 4: Simplify right side
    18,989.55x = 274,648,752.01
  5. Step 5: Solve for x
    x = 274,648,752.01/18,989.55
  6. Step 6: Final answer
    x = 14,463.15

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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.