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Finding the Fourth Proportional to 612.77, 845.44 and 379.89

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Solution

The fourth proportional to 612.77, 845.44 and 379.89 is: 524.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.77 : 845.44 = 379.89 : x
  2. Step 2: Convert to fraction form
    612.77/845.44 = 379.89/x
  3. Step 3: Cross multiply
    612.77x = 845.44 × 379.89
  4. Step 4: Simplify right side
    612.77x = 321,173.25
  5. Step 5: Solve for x
    x = 321,173.25/612.77
  6. Step 6: Final answer
    x = 524.14

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Find fourth proportional to 306.38, 422.72 and 189.95
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Double scale
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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.