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Finding the Fourth Proportional to 940.80, 1,411.79 and 454.35

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Solution

The fourth proportional to 940.80, 1,411.79 and 454.35 is: 681.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.80 : 1,411.79 = 454.35 : x
  2. Step 2: Convert to fraction form
    940.80/1,411.79 = 454.35/x
  3. Step 3: Cross multiply
    940.80x = 1,411.79 × 454.35
  4. Step 4: Simplify right side
    940.80x = 641,444.51
  5. Step 5: Solve for x
    x = 641,444.51/940.80
  6. Step 6: Final answer
    x = 681.81

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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.