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Finding the Fourth Proportional to 1,311.12, 1,967.63 and 618.57

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Solution

The fourth proportional to 1,311.12, 1,967.63 and 618.57 is: 928.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.12 : 1,967.63 = 618.57 : x
  2. Step 2: Convert to fraction form
    1,311.12/1,967.63 = 618.57/x
  3. Step 3: Cross multiply
    1,311.12x = 1,967.63 × 618.57
  4. Step 4: Simplify right side
    1,311.12x = 1,217,113.80
  5. Step 5: Solve for x
    x = 1,217,113.80/1,311.12
  6. Step 6: Final answer
    x = 928.30

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1.5x scale

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.