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Finding the Fourth Proportional to 639,390.78, 957,855.24 and 399,598.38

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Solution

The fourth proportional to 639,390.78, 957,855.24 and 399,598.38 is: 598,628.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,390.78 : 957,855.24 = 399,598.38 : x
  2. Step 2: Convert to fraction form
    639,390.78/957,855.24 = 399,598.38/x
  3. Step 3: Cross multiply
    639,390.78x = 957,855.24 × 399,598.38
  4. Step 4: Simplify right side
    639,390.78x = 382,757,402,178.51
  5. Step 5: Solve for x
    x = 382,757,402,178.51/639,390.78
  6. Step 6: Final answer
    x = 598,628.28

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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.