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Finding the Fourth Proportional to 831.44, 1,246.76 and 420.48

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Solution

The fourth proportional to 831.44, 1,246.76 and 420.48 is: 630.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.44 : 1,246.76 = 420.48 : x
  2. Step 2: Convert to fraction form
    831.44/1,246.76 = 420.48/x
  3. Step 3: Cross multiply
    831.44x = 1,246.76 × 420.48
  4. Step 4: Simplify right side
    831.44x = 524,237.64
  5. Step 5: Solve for x
    x = 524,237.64/831.44
  6. Step 6: Final answer
    x = 630.52

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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.