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Finding the Fourth Proportional to 520,408.80, 780,904.80 and 220,838.40

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Solution

The fourth proportional to 520,408.80, 780,904.80 and 220,838.40 is: 331,381.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,408.80 : 780,904.80 = 220,838.40 : x
  2. Step 2: Convert to fraction form
    520,408.80/780,904.80 = 220,838.40/x
  3. Step 3: Cross multiply
    520,408.80x = 780,904.80 × 220,838.40
  4. Step 4: Simplify right side
    520,408.80x = 172,453,766,584.32
  5. Step 5: Solve for x
    x = 172,453,766,584.32/520,408.80
  6. Step 6: Final answer
    x = 331,381.34

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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.