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Finding the Fourth Proportional to 1,008.74, 1,392.45 and 677.05

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Solution

The fourth proportional to 1,008.74, 1,392.45 and 677.05 is: 934.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.74 : 1,392.45 = 677.05 : x
  2. Step 2: Convert to fraction form
    1,008.74/1,392.45 = 677.05/x
  3. Step 3: Cross multiply
    1,008.74x = 1,392.45 × 677.05
  4. Step 4: Simplify right side
    1,008.74x = 942,758.27
  5. Step 5: Solve for x
    x = 942,758.27/1,008.74
  6. Step 6: Final answer
    x = 934.59

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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.