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Finding the Fourth Proportional to 18,917.76, 28,376.64 and 8,526.72

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Solution

The fourth proportional to 18,917.76, 28,376.64 and 8,526.72 is: 12,790.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.76 : 28,376.64 = 8,526.72 : x
  2. Step 2: Convert to fraction form
    18,917.76/28,376.64 = 8,526.72/x
  3. Step 3: Cross multiply
    18,917.76x = 28,376.64 × 8,526.72
  4. Step 4: Simplify right side
    18,917.76x = 241,959,663.82
  5. Step 5: Solve for x
    x = 241,959,663.82/18,917.76
  6. Step 6: Final answer
    x = 12,790.08

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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.