Home / 645,643.95-890,984.44-355,273.22

Finding the Fourth Proportional to 645,643.95, 890,984.44 and 355,273.22

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Solution

The fourth proportional to 645,643.95, 890,984.44 and 355,273.22 is: 490,274.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,643.95 : 890,984.44 = 355,273.22 : x
  2. Step 2: Convert to fraction form
    645,643.95/890,984.44 = 355,273.22/x
  3. Step 3: Cross multiply
    645,643.95x = 890,984.44 × 355,273.22
  4. Step 4: Simplify right side
    645,643.95x = 316,542,913,640.25
  5. Step 5: Solve for x
    x = 316,542,913,640.25/645,643.95
  6. Step 6: Final answer
    x = 490,274.73

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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.