Home / 1,685.25-2,325.65-939.20

Finding the Fourth Proportional to 1,685.25, 2,325.65 and 939.20

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Solution

The fourth proportional to 1,685.25, 2,325.65 and 939.20 is: 1,296.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.25 : 2,325.65 = 939.20 : x
  2. Step 2: Convert to fraction form
    1,685.25/2,325.65 = 939.20/x
  3. Step 3: Cross multiply
    1,685.25x = 2,325.65 × 939.20
  4. Step 4: Simplify right side
    1,685.25x = 2,184,234.16
  5. Step 5: Solve for x
    x = 2,184,234.16/1,685.25
  6. Step 6: Final answer
    x = 1,296.09

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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.