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Finding the Fourth Proportional to 639,669, 957,135.84 and 512,921.80

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Solution

The fourth proportional to 639,669, 957,135.84 and 512,921.80 is: 767,484.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,669 : 957,135.84 = 512,921.80 : x
  2. Step 2: Convert to fraction form
    639,669/957,135.84 = 512,921.80/x
  3. Step 3: Cross multiply
    639,669x = 957,135.84 × 512,921.80
  4. Step 4: Simplify right side
    639,669x = 490,935,837,897.31
  5. Step 5: Solve for x
    x = 490,935,837,897.31/639,669
  6. Step 6: Final answer
    x = 767,484.18

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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.