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Finding the Fourth Proportional to 996,409, 1,375,666.50 and 639,335.08

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Solution

The fourth proportional to 996,409, 1,375,666.50 and 639,335.08 is: 882,681.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    996,409 : 1,375,666.50 = 639,335.08 : x
  2. Step 2: Convert to fraction form
    996,409/1,375,666.50 = 639,335.08/x
  3. Step 3: Cross multiply
    996,409x = 1,375,666.50 × 639,335.08
  4. Step 4: Simplify right side
    996,409x = 879,511,851,830.82
  5. Step 5: Solve for x
    x = 879,511,851,830.82/996,409
  6. Step 6: Final answer
    x = 882,681.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.