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Finding the Fourth Proportional to 1,946.95, 2,920.89 and 648.43

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Solution

The fourth proportional to 1,946.95, 2,920.89 and 648.43 is: 972.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.95 : 2,920.89 = 648.43 : x
  2. Step 2: Convert to fraction form
    1,946.95/2,920.89 = 648.43/x
  3. Step 3: Cross multiply
    1,946.95x = 2,920.89 × 648.43
  4. Step 4: Simplify right side
    1,946.95x = 1,893,992.70
  5. Step 5: Solve for x
    x = 1,893,992.70/1,946.95
  6. Step 6: Final answer
    x = 972.80

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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.