Home / 100,478.93-138,660.38-55,157.69

Finding the Fourth Proportional to 100,478.93, 138,660.38 and 55,157.69

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Solution

The fourth proportional to 100,478.93, 138,660.38 and 55,157.69 is: 76,117.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,478.93 : 138,660.38 = 55,157.69 : x
  2. Step 2: Convert to fraction form
    100,478.93/138,660.38 = 55,157.69/x
  3. Step 3: Cross multiply
    100,478.93x = 138,660.38 × 55,157.69
  4. Step 4: Simplify right side
    100,478.93x = 7,648,185,699.91
  5. Step 5: Solve for x
    x = 7,648,185,699.91/100,478.93
  6. Step 6: Final answer
    x = 76,117.31

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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.