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Finding the Fourth Proportional to 389,627.60, 584,398.20 and 319,384.40

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Solution

The fourth proportional to 389,627.60, 584,398.20 and 319,384.40 is: 479,041.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,627.60 : 584,398.20 = 319,384.40 : x
  2. Step 2: Convert to fraction form
    389,627.60/584,398.20 = 319,384.40/x
  3. Step 3: Cross multiply
    389,627.60x = 584,398.20 × 319,384.40
  4. Step 4: Simplify right side
    389,627.60x = 186,647,668,468.08
  5. Step 5: Solve for x
    x = 186,647,668,468.08/389,627.60
  6. Step 6: Final answer
    x = 479,041.19

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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.