Home / 429,640.20-643,478.65-205,157.88

Finding the Fourth Proportional to 429,640.20, 643,478.65 and 205,157.88

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Solution

The fourth proportional to 429,640.20, 643,478.65 and 205,157.88 is: 307,268.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,640.20 : 643,478.65 = 205,157.88 : x
  2. Step 2: Convert to fraction form
    429,640.20/643,478.65 = 205,157.88/x
  3. Step 3: Cross multiply
    429,640.20x = 643,478.65 × 205,157.88
  4. Step 4: Simplify right side
    429,640.20x = 132,014,715,146.37
  5. Step 5: Solve for x
    x = 132,014,715,146.37/429,640.20
  6. Step 6: Final answer
    x = 307,268.07

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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.