Home / 138,437.32-191,021.88-78,004.84

Finding the Fourth Proportional to 138,437.32, 191,021.88 and 78,004.84

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Solution

The fourth proportional to 138,437.32, 191,021.88 and 78,004.84 is: 107,634.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,437.32 : 191,021.88 = 78,004.84 : x
  2. Step 2: Convert to fraction form
    138,437.32/191,021.88 = 78,004.84/x
  3. Step 3: Cross multiply
    138,437.32x = 191,021.88 × 78,004.84
  4. Step 4: Simplify right side
    138,437.32x = 14,900,631,185.90
  5. Step 5: Solve for x
    x = 14,900,631,185.90/138,437.32
  6. Step 6: Final answer
    x = 107,634.50

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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.