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Finding the Fourth Proportional to 860.35, 1,290.30 and 586.39

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Solution

The fourth proportional to 860.35, 1,290.30 and 586.39 is: 879.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.35 : 1,290.30 = 586.39 : x
  2. Step 2: Convert to fraction form
    860.35/1,290.30 = 586.39/x
  3. Step 3: Cross multiply
    860.35x = 1,290.30 × 586.39
  4. Step 4: Simplify right side
    860.35x = 756,619.02
  5. Step 5: Solve for x
    x = 756,619.02/860.35
  6. Step 6: Final answer
    x = 879.43

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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.