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Finding the Fourth Proportional to 860.10, 1,290.14 and 210.83

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Solution

The fourth proportional to 860.10, 1,290.14 and 210.83 is: 316.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.10 : 1,290.14 = 210.83 : x
  2. Step 2: Convert to fraction form
    860.10/1,290.14 = 210.83/x
  3. Step 3: Cross multiply
    860.10x = 1,290.14 × 210.83
  4. Step 4: Simplify right side
    860.10x = 271,992.71
  5. Step 5: Solve for x
    x = 271,992.71/860.10
  6. Step 6: Final answer
    x = 316.23

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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.