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Finding the Fourth Proportional to 940.12, 1,409.60 and 392.70

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Solution

The fourth proportional to 940.12, 1,409.60 and 392.70 is: 588.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.12 : 1,409.60 = 392.70 : x
  2. Step 2: Convert to fraction form
    940.12/1,409.60 = 392.70/x
  3. Step 3: Cross multiply
    940.12x = 1,409.60 × 392.70
  4. Step 4: Simplify right side
    940.12x = 553,549.92
  5. Step 5: Solve for x
    x = 553,549.92/940.12
  6. Step 6: Final answer
    x = 588.81

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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.