Home / 100,128.44-138,176.85-54,187.98

Finding the Fourth Proportional to 100,128.44, 138,176.85 and 54,187.98

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Solution

The fourth proportional to 100,128.44, 138,176.85 and 54,187.98 is: 74,779.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,128.44 : 138,176.85 = 54,187.98 : x
  2. Step 2: Convert to fraction form
    100,128.44/138,176.85 = 54,187.98/x
  3. Step 3: Cross multiply
    100,128.44x = 138,176.85 × 54,187.98
  4. Step 4: Simplify right side
    100,128.44x = 7,487,524,384.26
  5. Step 5: Solve for x
    x = 7,487,524,384.26/100,128.44
  6. Step 6: Final answer
    x = 74,779.20

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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.