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Finding the Fourth Proportional to 831.70, 1,146.45 and 622.72

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Solution

The fourth proportional to 831.70, 1,146.45 and 622.72 is: 858.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.70 : 1,146.45 = 622.72 : x
  2. Step 2: Convert to fraction form
    831.70/1,146.45 = 622.72/x
  3. Step 3: Cross multiply
    831.70x = 1,146.45 × 622.72
  4. Step 4: Simplify right side
    831.70x = 713,917.34
  5. Step 5: Solve for x
    x = 713,917.34/831.70
  6. Step 6: Final answer
    x = 858.38

Related Problems

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.