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Finding the Fourth Proportional to 1,006.80, 1,390.56 and 676.80

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Solution

The fourth proportional to 1,006.80, 1,390.56 and 676.80 is: 934.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.80 : 1,390.56 = 676.80 : x
  2. Step 2: Convert to fraction form
    1,006.80/1,390.56 = 676.80/x
  3. Step 3: Cross multiply
    1,006.80x = 1,390.56 × 676.80
  4. Step 4: Simplify right side
    1,006.80x = 941,131.01
  5. Step 5: Solve for x
    x = 941,131.01/1,006.80
  6. Step 6: Final answer
    x = 934.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.