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Finding the Fourth Proportional to 639,510.51, 959,360.54 and 212,907

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Solution

The fourth proportional to 639,510.51, 959,360.54 and 212,907 is: 319,392.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,510.51 : 959,360.54 = 212,907 : x
  2. Step 2: Convert to fraction form
    639,510.51/959,360.54 = 212,907/x
  3. Step 3: Cross multiply
    639,510.51x = 959,360.54 × 212,907
  4. Step 4: Simplify right side
    639,510.51x = 204,254,574,489.78
  5. Step 5: Solve for x
    x = 204,254,574,489.78/639,510.51
  6. Step 6: Final answer
    x = 319,392.05

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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.