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Finding the Fourth Proportional to 6,920.55, 10,380.15 and 1,990.08

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Solution

The fourth proportional to 6,920.55, 10,380.15 and 1,990.08 is: 2,984.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,920.55 : 10,380.15 = 1,990.08 : x
  2. Step 2: Convert to fraction form
    6,920.55/10,380.15 = 1,990.08/x
  3. Step 3: Cross multiply
    6,920.55x = 10,380.15 × 1,990.08
  4. Step 4: Simplify right side
    6,920.55x = 20,657,328.91
  5. Step 5: Solve for x
    x = 20,657,328.91/6,920.55
  6. Step 6: Final answer
    x = 2,984.93

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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.