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Finding the Fourth Proportional to 100,958.70, 139,323.93 and 55,638.30

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Solution

The fourth proportional to 100,958.70, 139,323.93 and 55,638.30 is: 76,781.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,958.70 : 139,323.93 = 55,638.30 : x
  2. Step 2: Convert to fraction form
    100,958.70/139,323.93 = 55,638.30/x
  3. Step 3: Cross multiply
    100,958.70x = 139,323.93 × 55,638.30
  4. Step 4: Simplify right side
    100,958.70x = 7,751,746,614.52
  5. Step 5: Solve for x
    x = 7,751,746,614.52/100,958.70
  6. Step 6: Final answer
    x = 76,781.36

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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.