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Finding the Fourth Proportional to 138,300.48, 190,855.44 and 78,684.48

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Solution

The fourth proportional to 138,300.48, 190,855.44 and 78,684.48 is: 108,585.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,300.48 : 190,855.44 = 78,684.48 : x
  2. Step 2: Convert to fraction form
    138,300.48/190,855.44 = 78,684.48/x
  3. Step 3: Cross multiply
    138,300.48x = 190,855.44 × 78,684.48
  4. Step 4: Simplify right side
    138,300.48x = 15,017,361,051.57
  5. Step 5: Solve for x
    x = 15,017,361,051.57/138,300.48
  6. Step 6: Final answer
    x = 108,585.02

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1.5x scale

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.