Home / 648,000.20-972,000.30-398,822.60

Finding the Fourth Proportional to 648,000.20, 972,000.30 and 398,822.60

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Solution

The fourth proportional to 648,000.20, 972,000.30 and 398,822.60 is: 598,233.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,000.20 : 972,000.30 = 398,822.60 : x
  2. Step 2: Convert to fraction form
    648,000.20/972,000.30 = 398,822.60/x
  3. Step 3: Cross multiply
    648,000.20x = 972,000.30 × 398,822.60
  4. Step 4: Simplify right side
    648,000.20x = 387,655,686,846.78
  5. Step 5: Solve for x
    x = 387,655,686,846.78/648,000.20
  6. Step 6: Final answer
    x = 598,233.90

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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.