Home / 39,685.34-54,764.05-21,780.65

Finding the Fourth Proportional to 39,685.34, 54,764.05 and 21,780.65

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Solution

The fourth proportional to 39,685.34, 54,764.05 and 21,780.65 is: 30,056.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,685.34 : 54,764.05 = 21,780.65 : x
  2. Step 2: Convert to fraction form
    39,685.34/54,764.05 = 21,780.65/x
  3. Step 3: Cross multiply
    39,685.34x = 54,764.05 × 21,780.65
  4. Step 4: Simplify right side
    39,685.34x = 1,192,796,605.63
  5. Step 5: Solve for x
    x = 1,192,796,605.63/39,685.34
  6. Step 6: Final answer
    x = 30,056.35

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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.