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Finding the Fourth Proportional to 28,516.79, 42,780.05 and 8,791.67

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Solution

The fourth proportional to 28,516.79, 42,780.05 and 8,791.67 is: 13,189.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,516.79 : 42,780.05 = 8,791.67 : x
  2. Step 2: Convert to fraction form
    28,516.79/42,780.05 = 8,791.67/x
  3. Step 3: Cross multiply
    28,516.79x = 42,780.05 × 8,791.67
  4. Step 4: Simplify right side
    28,516.79x = 376,108,178.14
  5. Step 5: Solve for x
    x = 376,108,178.14/28,516.79
  6. Step 6: Final answer
    x = 13,189.01

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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.