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Finding the Fourth Proportional to 860.30, 1,290.45 and 854.90

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Solution

The fourth proportional to 860.30, 1,290.45 and 854.90 is: 1,282.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.30 : 1,290.45 = 854.90 : x
  2. Step 2: Convert to fraction form
    860.30/1,290.45 = 854.90/x
  3. Step 3: Cross multiply
    860.30x = 1,290.45 × 854.90
  4. Step 4: Simplify right side
    860.30x = 1,103,205.71
  5. Step 5: Solve for x
    x = 1,103,205.71/860.30
  6. Step 6: Final answer
    x = 1,282.35

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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.