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Finding the Fourth Proportional to 572,720.97, 790,308.81 and 331,019.20

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Solution

The fourth proportional to 572,720.97, 790,308.81 and 331,019.20 is: 456,779.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,720.97 : 790,308.81 = 331,019.20 : x
  2. Step 2: Convert to fraction form
    572,720.97/790,308.81 = 331,019.20/x
  3. Step 3: Cross multiply
    572,720.97x = 790,308.81 × 331,019.20
  4. Step 4: Simplify right side
    572,720.97x = 261,607,390,039.15
  5. Step 5: Solve for x
    x = 261,607,390,039.15/572,720.97
  6. Step 6: Final answer
    x = 456,779.83

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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.