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Finding the Fourth Proportional to 1,589.77, 2,386.32 and 859.87

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Solution

The fourth proportional to 1,589.77, 2,386.32 and 859.87 is: 1,290.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,589.77 : 2,386.32 = 859.87 : x
  2. Step 2: Convert to fraction form
    1,589.77/2,386.32 = 859.87/x
  3. Step 3: Cross multiply
    1,589.77x = 2,386.32 × 859.87
  4. Step 4: Simplify right side
    1,589.77x = 2,051,924.98
  5. Step 5: Solve for x
    x = 2,051,924.98/1,589.77
  6. Step 6: Final answer
    x = 1,290.71

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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.