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Finding the Fourth Proportional to 429,436.80, 644,271.84 and 129,905.28

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Solution

The fourth proportional to 429,436.80, 644,271.84 and 129,905.28 is: 194,893.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,436.80 : 644,271.84 = 129,905.28 : x
  2. Step 2: Convert to fraction form
    429,436.80/644,271.84 = 129,905.28/x
  3. Step 3: Cross multiply
    429,436.80x = 644,271.84 × 129,905.28
  4. Step 4: Simplify right side
    429,436.80x = 83,694,313,771.32
  5. Step 5: Solve for x
    x = 83,694,313,771.32/429,436.80
  6. Step 6: Final answer
    x = 194,893.20

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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.