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Finding the Fourth Proportional to 869,720.90, 1,200,212.54 and 487,755.88

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Solution

The fourth proportional to 869,720.90, 1,200,212.54 and 487,755.88 is: 673,101.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    869,720.90 : 1,200,212.54 = 487,755.88 : x
  2. Step 2: Convert to fraction form
    869,720.90/1,200,212.54 = 487,755.88/x
  3. Step 3: Cross multiply
    869,720.90x = 1,200,212.54 × 487,755.88
  4. Step 4: Simplify right side
    869,720.90x = 585,410,720,024.51
  5. Step 5: Solve for x
    x = 585,410,720,024.51/869,720.90
  6. Step 6: Final answer
    x = 673,101.82

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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.