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Finding the Fourth Proportional to 557,132, 768,851.20 and 315,408.32

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Solution

The fourth proportional to 557,132, 768,851.20 and 315,408.32 is: 435,268.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    557,132 : 768,851.20 = 315,408.32 : x
  2. Step 2: Convert to fraction form
    557,132/768,851.20 = 315,408.32/x
  3. Step 3: Cross multiply
    557,132x = 768,851.20 × 315,408.32
  4. Step 4: Simplify right side
    557,132x = 242,502,065,321.98
  5. Step 5: Solve for x
    x = 242,502,065,321.98/557,132
  6. Step 6: Final answer
    x = 435,268.60

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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.