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Finding the Fourth Proportional to 389,464.60, 584,153.70 and 319,221.40

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Solution

The fourth proportional to 389,464.60, 584,153.70 and 319,221.40 is: 478,796.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,464.60 : 584,153.70 = 319,221.40 : x
  2. Step 2: Convert to fraction form
    389,464.60/584,153.70 = 319,221.40/x
  3. Step 3: Cross multiply
    389,464.60x = 584,153.70 × 319,221.40
  4. Step 4: Simplify right side
    389,464.60x = 186,474,361,929.18
  5. Step 5: Solve for x
    x = 186,474,361,929.18/389,464.60
  6. Step 6: Final answer
    x = 478,796.69

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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.