Home / 1,290,380-1,780,640.16-717,399.68

Finding the Fourth Proportional to 1,290,380, 1,780,640.16 and 717,399.68

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Solution

The fourth proportional to 1,290,380, 1,780,640.16 and 717,399.68 is: 989,964.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,380 : 1,780,640.16 = 717,399.68 : x
  2. Step 2: Convert to fraction form
    1,290,380/1,780,640.16 = 717,399.68/x
  3. Step 3: Cross multiply
    1,290,380x = 1,780,640.16 × 717,399.68
  4. Step 4: Simplify right side
    1,290,380x = 1,277,430,680,979.15
  5. Step 5: Solve for x
    x = 1,277,430,680,979.15/1,290,380
  6. Step 6: Final answer
    x = 989,964.72

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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.