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Finding the Fourth Proportional to 81,300.90, 121,987.80 and 36,904.80

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Solution

The fourth proportional to 81,300.90, 121,987.80 and 36,904.80 is: 55,373.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,300.90 : 121,987.80 = 36,904.80 : x
  2. Step 2: Convert to fraction form
    81,300.90/121,987.80 = 36,904.80/x
  3. Step 3: Cross multiply
    81,300.90x = 121,987.80 × 36,904.80
  4. Step 4: Simplify right side
    81,300.90x = 4,501,935,361.44
  5. Step 5: Solve for x
    x = 4,501,935,361.44/81,300.90
  6. Step 6: Final answer
    x = 55,373.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.