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Finding the Fourth Proportional to 645,087.60, 967,339.80 and 289,918.80

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Solution

The fourth proportional to 645,087.60, 967,339.80 and 289,918.80 is: 434,747.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,087.60 : 967,339.80 = 289,918.80 : x
  2. Step 2: Convert to fraction form
    645,087.60/967,339.80 = 289,918.80/x
  3. Step 3: Cross multiply
    645,087.60x = 967,339.80 × 289,918.80
  4. Step 4: Simplify right side
    645,087.60x = 280,449,994,008.24
  5. Step 5: Solve for x
    x = 280,449,994,008.24/645,087.60
  6. Step 6: Final answer
    x = 434,747.15

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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.