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Finding the Fourth Proportional to 853.51, 1,279.86 and 391.41

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Solution

The fourth proportional to 853.51, 1,279.86 and 391.41 is: 586.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.51 : 1,279.86 = 391.41 : x
  2. Step 2: Convert to fraction form
    853.51/1,279.86 = 391.41/x
  3. Step 3: Cross multiply
    853.51x = 1,279.86 × 391.41
  4. Step 4: Simplify right side
    853.51x = 500,950.00
  5. Step 5: Solve for x
    x = 500,950.00/853.51
  6. Step 6: Final answer
    x = 586.93

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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.