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Finding the Fourth Proportional to 18,917.40, 28,376.10 and 9,586.20

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Solution

The fourth proportional to 18,917.40, 28,376.10 and 9,586.20 is: 14,379.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.40 : 28,376.10 = 9,586.20 : x
  2. Step 2: Convert to fraction form
    18,917.40/28,376.10 = 9,586.20/x
  3. Step 3: Cross multiply
    18,917.40x = 28,376.10 × 9,586.20
  4. Step 4: Simplify right side
    18,917.40x = 272,018,969.82
  5. Step 5: Solve for x
    x = 272,018,969.82/18,917.40
  6. Step 6: Final answer
    x = 14,379.30

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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.