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Finding the Fourth Proportional to 1,926.90, 2,890.80 and 628.38

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Solution

The fourth proportional to 1,926.90, 2,890.80 and 628.38 is: 942.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,926.90 : 2,890.80 = 628.38 : x
  2. Step 2: Convert to fraction form
    1,926.90/2,890.80 = 628.38/x
  3. Step 3: Cross multiply
    1,926.90x = 2,890.80 × 628.38
  4. Step 4: Simplify right side
    1,926.90x = 1,816,520.90
  5. Step 5: Solve for x
    x = 1,816,520.90/1,926.90
  6. Step 6: Final answer
    x = 942.72

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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.