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Finding the Fourth Proportional to 398,515.80, 598,464.90 and 386,074.20

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Solution

The fourth proportional to 398,515.80, 598,464.90 and 386,074.20 is: 579,780.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,515.80 : 598,464.90 = 386,074.20 : x
  2. Step 2: Convert to fraction form
    398,515.80/598,464.90 = 386,074.20/x
  3. Step 3: Cross multiply
    398,515.80x = 598,464.90 × 386,074.20
  4. Step 4: Simplify right side
    398,515.80x = 231,051,857,495.58
  5. Step 5: Solve for x
    x = 231,051,857,495.58/398,515.80
  6. Step 6: Final answer
    x = 579,780.92

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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.