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Finding the Fourth Proportional to 3,218.22, 4,827.33 and 909.72

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Solution

The fourth proportional to 3,218.22, 4,827.33 and 909.72 is: 1,364.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,218.22 : 4,827.33 = 909.72 : x
  2. Step 2: Convert to fraction form
    3,218.22/4,827.33 = 909.72/x
  3. Step 3: Cross multiply
    3,218.22x = 4,827.33 × 909.72
  4. Step 4: Simplify right side
    3,218.22x = 4,391,518.65
  5. Step 5: Solve for x
    x = 4,391,518.65/3,218.22
  6. Step 6: Final answer
    x = 1,364.58

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Double scale
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Similar ratio
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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.