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Finding the Fourth Proportional to 940.10, 1,409.60 and 391.98

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Solution

The fourth proportional to 940.10, 1,409.60 and 391.98 is: 587.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.10 : 1,409.60 = 391.98 : x
  2. Step 2: Convert to fraction form
    940.10/1,409.60 = 391.98/x
  3. Step 3: Cross multiply
    940.10x = 1,409.60 × 391.98
  4. Step 4: Simplify right side
    940.10x = 552,535.01
  5. Step 5: Solve for x
    x = 552,535.01/940.10
  6. Step 6: Final answer
    x = 587.74

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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.