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Finding the Fourth Proportional to 138,525.75, 191,165.58 and 78,909.75

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Solution

The fourth proportional to 138,525.75, 191,165.58 and 78,909.75 is: 108,895.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,525.75 : 191,165.58 = 78,909.75 : x
  2. Step 2: Convert to fraction form
    138,525.75/191,165.58 = 78,909.75/x
  3. Step 3: Cross multiply
    138,525.75x = 191,165.58 × 78,909.75
  4. Step 4: Simplify right side
    138,525.75x = 15,084,828,126.41
  5. Step 5: Solve for x
    x = 15,084,828,126.41/138,525.75
  6. Step 6: Final answer
    x = 108,895.48

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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.