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Finding the Fourth Proportional to 290,821.20, 436,231.80 and 288,056.40

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Solution

The fourth proportional to 290,821.20, 436,231.80 and 288,056.40 is: 432,084.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,821.20 : 436,231.80 = 288,056.40 : x
  2. Step 2: Convert to fraction form
    290,821.20/436,231.80 = 288,056.40/x
  3. Step 3: Cross multiply
    290,821.20x = 436,231.80 × 288,056.40
  4. Step 4: Simplify right side
    290,821.20x = 125,659,361,873.52
  5. Step 5: Solve for x
    x = 125,659,361,873.52/290,821.20
  6. Step 6: Final answer
    x = 432,084.60

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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.