Home / 819,000.45-1,228,008.60-420,419.70

Finding the Fourth Proportional to 819,000.45, 1,228,008.60 and 420,419.70

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Solution

The fourth proportional to 819,000.45, 1,228,008.60 and 420,419.70 is: 630,376.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    819,000.45 : 1,228,008.60 = 420,419.70 : x
  2. Step 2: Convert to fraction form
    819,000.45/1,228,008.60 = 420,419.70/x
  3. Step 3: Cross multiply
    819,000.45x = 1,228,008.60 × 420,419.70
  4. Step 4: Simplify right side
    819,000.45x = 516,279,007,209.42
  5. Step 5: Solve for x
    x = 516,279,007,209.42/819,000.45
  6. Step 6: Final answer
    x = 630,376.95

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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.