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Finding the Fourth Proportional to 18,989.61, 28,502.28 and 9,636.34

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Solution

The fourth proportional to 18,989.61, 28,502.28 and 9,636.34 is: 14,463.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.61 : 28,502.28 = 9,636.34 : x
  2. Step 2: Convert to fraction form
    18,989.61/28,502.28 = 9,636.34/x
  3. Step 3: Cross multiply
    18,989.61x = 28,502.28 × 9,636.34
  4. Step 4: Simplify right side
    18,989.61x = 274,657,660.86
  5. Step 5: Solve for x
    x = 274,657,660.86/18,989.61
  6. Step 6: Final answer
    x = 14,463.58

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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.