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Finding the Fourth Proportional to 520,905.30, 780,129.15 and 321,839.70

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Solution

The fourth proportional to 520,905.30, 780,129.15 and 321,839.70 is: 482,000.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,905.30 : 780,129.15 = 321,839.70 : x
  2. Step 2: Convert to fraction form
    520,905.30/780,129.15 = 321,839.70/x
  3. Step 3: Cross multiply
    520,905.30x = 780,129.15 × 321,839.70
  4. Step 4: Simplify right side
    520,905.30x = 251,076,531,597.26
  5. Step 5: Solve for x
    x = 251,076,531,597.26/520,905.30
  6. Step 6: Final answer
    x = 482,000.34

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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.