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Finding the Fourth Proportional to 639,812.49, 959,716 and 260,648.65

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Solution

The fourth proportional to 639,812.49, 959,716 and 260,648.65 is: 390,971.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,812.49 : 959,716 = 260,648.65 : x
  2. Step 2: Convert to fraction form
    639,812.49/959,716 = 260,648.65/x
  3. Step 3: Cross multiply
    639,812.49x = 959,716 × 260,648.65
  4. Step 4: Simplify right side
    639,812.49x = 250,148,679,783.40
  5. Step 5: Solve for x
    x = 250,148,679,783.40/639,812.49
  6. Step 6: Final answer
    x = 390,971.86

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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.