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Finding the Fourth Proportional to 860.21, 1,289.98 and 366.30

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Solution

The fourth proportional to 860.21, 1,289.98 and 366.30 is: 549.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.21 : 1,289.98 = 366.30 : x
  2. Step 2: Convert to fraction form
    860.21/1,289.98 = 366.30/x
  3. Step 3: Cross multiply
    860.21x = 1,289.98 × 366.30
  4. Step 4: Simplify right side
    860.21x = 472,525.66
  5. Step 5: Solve for x
    x = 472,525.66/860.21
  6. Step 6: Final answer
    x = 549.32

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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.