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Finding the Fourth Proportional to 940.36, 1,404.30 and 930.20

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Solution

The fourth proportional to 940.36, 1,404.30 and 930.20 is: 1,389.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.36 : 1,404.30 = 930.20 : x
  2. Step 2: Convert to fraction form
    940.36/1,404.30 = 930.20/x
  3. Step 3: Cross multiply
    940.36x = 1,404.30 × 930.20
  4. Step 4: Simplify right side
    940.36x = 1,306,279.86
  5. Step 5: Solve for x
    x = 1,306,279.86/940.36
  6. Step 6: Final answer
    x = 1,389.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.