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Finding the Fourth Proportional to 38,757.99, 53,476.88 and 21,990.99

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Solution

The fourth proportional to 38,757.99, 53,476.88 and 21,990.99 is: 30,342.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,757.99 : 53,476.88 = 21,990.99 : x
  2. Step 2: Convert to fraction form
    38,757.99/53,476.88 = 21,990.99/x
  3. Step 3: Cross multiply
    38,757.99x = 53,476.88 × 21,990.99
  4. Step 4: Simplify right side
    38,757.99x = 1,176,009,533.31
  5. Step 5: Solve for x
    x = 1,176,009,533.31/38,757.99
  6. Step 6: Final answer
    x = 30,342.38

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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.