Home / 39,685.59-54,764.40-21,780.90

Finding the Fourth Proportional to 39,685.59, 54,764.40 and 21,780.90

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Solution

The fourth proportional to 39,685.59, 54,764.40 and 21,780.90 is: 30,056.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,685.59 : 54,764.40 = 21,780.90 : x
  2. Step 2: Convert to fraction form
    39,685.59/54,764.40 = 21,780.90/x
  3. Step 3: Cross multiply
    39,685.59x = 54,764.40 × 21,780.90
  4. Step 4: Simplify right side
    39,685.59x = 1,192,817,811.06
  5. Step 5: Solve for x
    x = 1,192,817,811.06/39,685.59
  6. Step 6: Final answer
    x = 30,056.70

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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.