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Finding the Fourth Proportional to 860.20, 1,205.90 and 860.20

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Solution

The fourth proportional to 860.20, 1,205.90 and 860.20 is: 1,205.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.20 : 1,205.90 = 860.20 : x
  2. Step 2: Convert to fraction form
    860.20/1,205.90 = 860.20/x
  3. Step 3: Cross multiply
    860.20x = 1,205.90 × 860.20
  4. Step 4: Simplify right side
    860.20x = 1,037,315.18
  5. Step 5: Solve for x
    x = 1,037,315.18/860.20
  6. Step 6: Final answer
    x = 1,205.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.