Home / 138,405.50-190,999.59-74,743.30

Finding the Fourth Proportional to 138,405.50, 190,999.59 and 74,743.30

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Solution

The fourth proportional to 138,405.50, 190,999.59 and 74,743.30 is: 103,145.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,405.50 : 190,999.59 = 74,743.30 : x
  2. Step 2: Convert to fraction form
    138,405.50/190,999.59 = 74,743.30/x
  3. Step 3: Cross multiply
    138,405.50x = 190,999.59 × 74,743.30
  4. Step 4: Simplify right side
    138,405.50x = 14,275,939,655.25
  5. Step 5: Solve for x
    x = 14,275,939,655.25/138,405.50
  6. Step 6: Final answer
    x = 103,145.75

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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.