Home / 1,311.15-1,966.72-489.63

Finding the Fourth Proportional to 1,311.15, 1,966.72 and 489.63

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Solution

The fourth proportional to 1,311.15, 1,966.72 and 489.63 is: 734.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.15 : 1,966.72 = 489.63 : x
  2. Step 2: Convert to fraction form
    1,311.15/1,966.72 = 489.63/x
  3. Step 3: Cross multiply
    1,311.15x = 1,966.72 × 489.63
  4. Step 4: Simplify right side
    1,311.15x = 962,965.11
  5. Step 5: Solve for x
    x = 962,965.11/1,311.15
  6. Step 6: Final answer
    x = 734.44

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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.