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Finding the Fourth Proportional to 1,678.80, 2,512.80 and 1,192.80

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Solution

The fourth proportional to 1,678.80, 2,512.80 and 1,192.80 is: 1,785.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.80 : 2,512.80 = 1,192.80 : x
  2. Step 2: Convert to fraction form
    1,678.80/2,512.80 = 1,192.80/x
  3. Step 3: Cross multiply
    1,678.80x = 2,512.80 × 1,192.80
  4. Step 4: Simplify right side
    1,678.80x = 2,997,267.84
  5. Step 5: Solve for x
    x = 2,997,267.84/1,678.80
  6. Step 6: Final answer
    x = 1,785.36

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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.