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Finding the Fourth Proportional to 208,394.92, 312,216.54 and 128,293.48

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Solution

The fourth proportional to 208,394.92, 312,216.54 and 128,293.48 is: 192,208.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,394.92 : 312,216.54 = 128,293.48 : x
  2. Step 2: Convert to fraction form
    208,394.92/312,216.54 = 128,293.48/x
  3. Step 3: Cross multiply
    208,394.92x = 312,216.54 × 128,293.48
  4. Step 4: Simplify right side
    208,394.92x = 40,055,346,430.16
  5. Step 5: Solve for x
    x = 40,055,346,430.16/208,394.92
  6. Step 6: Final answer
    x = 192,208.84

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1.5x scale

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.