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Finding the Fourth Proportional to 38,855.91, 53,621.08 and 21,860.18

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Solution

The fourth proportional to 38,855.91, 53,621.08 and 21,860.18 is: 30,167.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,855.91 : 53,621.08 = 21,860.18 : x
  2. Step 2: Convert to fraction form
    38,855.91/53,621.08 = 21,860.18/x
  3. Step 3: Cross multiply
    38,855.91x = 53,621.08 × 21,860.18
  4. Step 4: Simplify right side
    38,855.91x = 1,172,166,460.59
  5. Step 5: Solve for x
    x = 1,172,166,460.59/38,855.91
  6. Step 6: Final answer
    x = 30,167.01

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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.