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Finding the Fourth Proportional to 1,981.68, 2,970.60 and 826.80

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Solution

The fourth proportional to 1,981.68, 2,970.60 and 826.80 is: 1,239.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.68 : 2,970.60 = 826.80 : x
  2. Step 2: Convert to fraction form
    1,981.68/2,970.60 = 826.80/x
  3. Step 3: Cross multiply
    1,981.68x = 2,970.60 × 826.80
  4. Step 4: Simplify right side
    1,981.68x = 2,456,092.08
  5. Step 5: Solve for x
    x = 2,456,092.08/1,981.68
  6. Step 6: Final answer
    x = 1,239.40

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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.