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Finding the Fourth Proportional to 515,128.55, 710,919.96 and 285,759.79

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Solution

The fourth proportional to 515,128.55, 710,919.96 and 285,759.79 is: 394,372.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,128.55 : 710,919.96 = 285,759.79 : x
  2. Step 2: Convert to fraction form
    515,128.55/710,919.96 = 285,759.79/x
  3. Step 3: Cross multiply
    515,128.55x = 710,919.96 × 285,759.79
  4. Step 4: Simplify right side
    515,128.55x = 203,152,335,627.51
  5. Step 5: Solve for x
    x = 203,152,335,627.51/515,128.55
  6. Step 6: Final answer
    x = 394,372.12

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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.