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Finding the Fourth Proportional to 439,432.80, 659,408.40 and 290,104.80

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Solution

The fourth proportional to 439,432.80, 659,408.40 and 290,104.80 is: 435,328.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,432.80 : 659,408.40 = 290,104.80 : x
  2. Step 2: Convert to fraction form
    439,432.80/659,408.40 = 290,104.80/x
  3. Step 3: Cross multiply
    439,432.80x = 659,408.40 × 290,104.80
  4. Step 4: Simplify right side
    439,432.80x = 191,297,542,000.32
  5. Step 5: Solve for x
    x = 191,297,542,000.32/439,432.80
  6. Step 6: Final answer
    x = 435,328.32

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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.