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Finding the Fourth Proportional to 1,968.78, 2,953.60 and 928.80

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Solution

The fourth proportional to 1,968.78, 2,953.60 and 928.80 is: 1,393.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,968.78 : 2,953.60 = 928.80 : x
  2. Step 2: Convert to fraction form
    1,968.78/2,953.60 = 928.80/x
  3. Step 3: Cross multiply
    1,968.78x = 2,953.60 × 928.80
  4. Step 4: Simplify right side
    1,968.78x = 2,743,303.68
  5. Step 5: Solve for x
    x = 2,743,303.68/1,968.78
  6. Step 6: Final answer
    x = 1,393.40

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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.