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Finding the Fourth Proportional to 831.02, 1,244.57 and 418.86

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Solution

The fourth proportional to 831.02, 1,244.57 and 418.86 is: 627.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.02 : 1,244.57 = 418.86 : x
  2. Step 2: Convert to fraction form
    831.02/1,244.57 = 418.86/x
  3. Step 3: Cross multiply
    831.02x = 1,244.57 × 418.86
  4. Step 4: Simplify right side
    831.02x = 521,298.50
  5. Step 5: Solve for x
    x = 521,298.50/831.02
  6. Step 6: Final answer
    x = 627.30

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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.