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Finding the Fourth Proportional to 8,631.76, 12,938.65 and 5,858.65

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Solution

The fourth proportional to 8,631.76, 12,938.65 and 5,858.65 is: 8,781.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,631.76 : 12,938.65 = 5,858.65 : x
  2. Step 2: Convert to fraction form
    8,631.76/12,938.65 = 5,858.65/x
  3. Step 3: Cross multiply
    8,631.76x = 12,938.65 × 5,858.65
  4. Step 4: Simplify right side
    8,631.76x = 75,803,021.82
  5. Step 5: Solve for x
    x = 75,803,021.82/8,631.76
  6. Step 6: Final answer
    x = 8,781.87

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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.