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Finding the Fourth Proportional to 647,631.40, 970,280.70 and 398,021.80

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Solution

The fourth proportional to 647,631.40, 970,280.70 and 398,021.80 is: 596,315.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,631.40 : 970,280.70 = 398,021.80 : x
  2. Step 2: Convert to fraction form
    647,631.40/970,280.70 = 398,021.80/x
  3. Step 3: Cross multiply
    647,631.40x = 970,280.70 × 398,021.80
  4. Step 4: Simplify right side
    647,631.40x = 386,192,870,719.26
  5. Step 5: Solve for x
    x = 386,192,870,719.26/647,631.40
  6. Step 6: Final answer
    x = 596,315.85

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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.