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Finding the Fourth Proportional to 830.49, 1,245.74 and 253.37

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Solution

The fourth proportional to 830.49, 1,245.74 and 253.37 is: 380.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.49 : 1,245.74 = 253.37 : x
  2. Step 2: Convert to fraction form
    830.49/1,245.74 = 253.37/x
  3. Step 3: Cross multiply
    830.49x = 1,245.74 × 253.37
  4. Step 4: Simplify right side
    830.49x = 315,625.65
  5. Step 5: Solve for x
    x = 315,625.65/830.49
  6. Step 6: Final answer
    x = 380.05

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Half scale
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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.