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Finding the Fourth Proportional to 1,685.85, 2,326.59 and 939.99

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Solution

The fourth proportional to 1,685.85, 2,326.59 and 939.99 is: 1,297.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.85 : 2,326.59 = 939.99 : x
  2. Step 2: Convert to fraction form
    1,685.85/2,326.59 = 939.99/x
  3. Step 3: Cross multiply
    1,685.85x = 2,326.59 × 939.99
  4. Step 4: Simplify right side
    1,685.85x = 2,186,971.33
  5. Step 5: Solve for x
    x = 2,186,971.33/1,685.85
  6. Step 6: Final answer
    x = 1,297.25

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1.5x scale

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.