Home / 678,985.20-1,019,255.40-398,660.40

Finding the Fourth Proportional to 678,985.20, 1,019,255.40 and 398,660.40

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Solution

The fourth proportional to 678,985.20, 1,019,255.40 and 398,660.40 is: 598,447.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,985.20 : 1,019,255.40 = 398,660.40 : x
  2. Step 2: Convert to fraction form
    678,985.20/1,019,255.40 = 398,660.40/x
  3. Step 3: Cross multiply
    678,985.20x = 1,019,255.40 × 398,660.40
  4. Step 4: Simplify right side
    678,985.20x = 406,336,765,466.16
  5. Step 5: Solve for x
    x = 406,336,765,466.16/678,985.20
  6. Step 6: Final answer
    x = 598,447.16

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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.