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Finding the Fourth Proportional to 1,219.70, 1,831.17 and 830.90

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Solution

The fourth proportional to 1,219.70, 1,831.17 and 830.90 is: 1,247.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.70 : 1,831.17 = 830.90 : x
  2. Step 2: Convert to fraction form
    1,219.70/1,831.17 = 830.90/x
  3. Step 3: Cross multiply
    1,219.70x = 1,831.17 × 830.90
  4. Step 4: Simplify right side
    1,219.70x = 1,521,519.15
  5. Step 5: Solve for x
    x = 1,521,519.15/1,219.70
  6. Step 6: Final answer
    x = 1,247.45

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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.