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Finding the Fourth Proportional to 515,661.90, 772,701.68 and 215,978.52

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Solution

The fourth proportional to 515,661.90, 772,701.68 and 215,978.52 is: 323,636.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,661.90 : 772,701.68 = 215,978.52 : x
  2. Step 2: Convert to fraction form
    515,661.90/772,701.68 = 215,978.52/x
  3. Step 3: Cross multiply
    515,661.90x = 772,701.68 × 215,978.52
  4. Step 4: Simplify right side
    515,661.90x = 166,886,965,247.91
  5. Step 5: Solve for x
    x = 166,886,965,247.91/515,661.90
  6. Step 6: Final answer
    x = 323,636.41

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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.