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Finding the Fourth Proportional to 18,911.61, 28,384.92 and 9,558.21

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Solution

The fourth proportional to 18,911.61, 28,384.92 and 9,558.21 is: 14,346.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.61 : 28,384.92 = 9,558.21 : x
  2. Step 2: Convert to fraction form
    18,911.61/28,384.92 = 9,558.21/x
  3. Step 3: Cross multiply
    18,911.61x = 28,384.92 × 9,558.21
  4. Step 4: Simplify right side
    18,911.61x = 271,309,026.19
  5. Step 5: Solve for x
    x = 271,309,026.19/18,911.61
  6. Step 6: Final answer
    x = 14,346.16

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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.