Home / 138,437.28-191,047.41-78,004.60

Finding the Fourth Proportional to 138,437.28, 191,047.41 and 78,004.60

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Solution

The fourth proportional to 138,437.28, 191,047.41 and 78,004.60 is: 107,648.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,437.28 : 191,047.41 = 78,004.60 : x
  2. Step 2: Convert to fraction form
    138,437.28/191,047.41 = 78,004.60/x
  3. Step 3: Cross multiply
    138,437.28x = 191,047.41 × 78,004.60
  4. Step 4: Simplify right side
    138,437.28x = 14,902,576,515.48
  5. Step 5: Solve for x
    x = 14,902,576,515.48/138,437.28
  6. Step 6: Final answer
    x = 107,648.58

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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.