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Finding the Fourth Proportional to 685.80, 946.26 and 406.04

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Solution

The fourth proportional to 685.80, 946.26 and 406.04 is: 560.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.80 : 946.26 = 406.04 : x
  2. Step 2: Convert to fraction form
    685.80/946.26 = 406.04/x
  3. Step 3: Cross multiply
    685.80x = 946.26 × 406.04
  4. Step 4: Simplify right side
    685.80x = 384,219.41
  5. Step 5: Solve for x
    x = 384,219.41/685.80
  6. Step 6: Final answer
    x = 560.25

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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.