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Finding the Fourth Proportional to 830.38, 1,245.57 and 253.25

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Solution

The fourth proportional to 830.38, 1,245.57 and 253.25 is: 379.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.38 : 1,245.57 = 253.25 : x
  2. Step 2: Convert to fraction form
    830.38/1,245.57 = 253.25/x
  3. Step 3: Cross multiply
    830.38x = 1,245.57 × 253.25
  4. Step 4: Simplify right side
    830.38x = 315,439.34
  5. Step 5: Solve for x
    x = 315,439.34/830.38
  6. Step 6: Final answer
    x = 379.88

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Half scale
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Double scale
Find fourth proportional to 831.38, 1,247.07 and 254.25
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.