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Finding the Fourth Proportional to 639,021.90, 957,366.45 and 389,412.30

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Solution

The fourth proportional to 639,021.90, 957,366.45 and 389,412.30 is: 583,407.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,021.90 : 957,366.45 = 389,412.30 : x
  2. Step 2: Convert to fraction form
    639,021.90/957,366.45 = 389,412.30/x
  3. Step 3: Cross multiply
    639,021.90x = 957,366.45 × 389,412.30
  4. Step 4: Simplify right side
    639,021.90x = 372,810,271,237.34
  5. Step 5: Solve for x
    x = 372,810,271,237.34/639,021.90
  6. Step 6: Final answer
    x = 583,407.66

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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.