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Finding the Fourth Proportional to 831.16, 1,246.74 and 505.90

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Solution

The fourth proportional to 831.16, 1,246.74 and 505.90 is: 758.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.16 : 1,246.74 = 505.90 : x
  2. Step 2: Convert to fraction form
    831.16/1,246.74 = 505.90/x
  3. Step 3: Cross multiply
    831.16x = 1,246.74 × 505.90
  4. Step 4: Simplify right side
    831.16x = 630,725.77
  5. Step 5: Solve for x
    x = 630,725.77/831.16
  6. Step 6: Final answer
    x = 758.85

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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.