Home / 1,292.90-1,939.34-318.99

Finding the Fourth Proportional to 1,292.90, 1,939.34 and 318.99

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Solution

The fourth proportional to 1,292.90, 1,939.34 and 318.99 is: 478.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.90 : 1,939.34 = 318.99 : x
  2. Step 2: Convert to fraction form
    1,292.90/1,939.34 = 318.99/x
  3. Step 3: Cross multiply
    1,292.90x = 1,939.34 × 318.99
  4. Step 4: Simplify right side
    1,292.90x = 618,628.47
  5. Step 5: Solve for x
    x = 618,628.47/1,292.90
  6. Step 6: Final answer
    x = 478.48

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.