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Finding the Fourth Proportional to 996,408, 1,375,665.12 and 639,334.08

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Solution

The fourth proportional to 996,408, 1,375,665.12 and 639,334.08 is: 882,680.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    996,408 : 1,375,665.12 = 639,334.08 : x
  2. Step 2: Convert to fraction form
    996,408/1,375,665.12 = 639,334.08/x
  3. Step 3: Cross multiply
    996,408x = 1,375,665.12 × 639,334.08
  4. Step 4: Simplify right side
    996,408x = 879,509,593,883.29
  5. Step 5: Solve for x
    x = 879,509,593,883.29/996,408
  6. Step 6: Final answer
    x = 882,680.18

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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.