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Finding the Fourth Proportional to 853.81, 1,279.13 and 545.00

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Solution

The fourth proportional to 853.81, 1,279.13 and 545.00 is: 816.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.81 : 1,279.13 = 545.00 : x
  2. Step 2: Convert to fraction form
    853.81/1,279.13 = 545.00/x
  3. Step 3: Cross multiply
    853.81x = 1,279.13 × 545.00
  4. Step 4: Simplify right side
    853.81x = 697,116.73
  5. Step 5: Solve for x
    x = 697,116.73/853.81
  6. Step 6: Final answer
    x = 816.48

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Double scale
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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.