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Finding the Fourth Proportional to 639,840, 882,979.20 and 371,585.28

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Solution

The fourth proportional to 639,840, 882,979.20 and 371,585.28 is: 512,787.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,840 : 882,979.20 = 371,585.28 : x
  2. Step 2: Convert to fraction form
    639,840/882,979.20 = 371,585.28/x
  3. Step 3: Cross multiply
    639,840x = 882,979.20 × 371,585.28
  4. Step 4: Simplify right side
    639,840x = 328,102,073,266.18
  5. Step 5: Solve for x
    x = 328,102,073,266.18/639,840
  6. Step 6: Final answer
    x = 512,787.69

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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.