Home / 1,119.20-1,680.70-625.40

Finding the Fourth Proportional to 1,119.20, 1,680.70 and 625.40

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Solution

The fourth proportional to 1,119.20, 1,680.70 and 625.40 is: 939.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.20 : 1,680.70 = 625.40 : x
  2. Step 2: Convert to fraction form
    1,119.20/1,680.70 = 625.40/x
  3. Step 3: Cross multiply
    1,119.20x = 1,680.70 × 625.40
  4. Step 4: Simplify right side
    1,119.20x = 1,051,109.78
  5. Step 5: Solve for x
    x = 1,051,109.78/1,119.20
  6. Step 6: Final answer
    x = 939.16

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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.