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Finding the Fourth Proportional to 1,298.63, 1,949.10 and 858.67

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Solution

The fourth proportional to 1,298.63, 1,949.10 and 858.67 is: 1,288.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.63 : 1,949.10 = 858.67 : x
  2. Step 2: Convert to fraction form
    1,298.63/1,949.10 = 858.67/x
  3. Step 3: Cross multiply
    1,298.63x = 1,949.10 × 858.67
  4. Step 4: Simplify right side
    1,298.63x = 1,673,625.60
  5. Step 5: Solve for x
    x = 1,673,625.60/1,298.63
  6. Step 6: Final answer
    x = 1,288.76

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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.