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Finding the Fourth Proportional to 38,757.47, 53,485.38 and 21,990.47

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Solution

The fourth proportional to 38,757.47, 53,485.38 and 21,990.47 is: 30,346.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,757.47 : 53,485.38 = 21,990.47 : x
  2. Step 2: Convert to fraction form
    38,757.47/53,485.38 = 21,990.47/x
  3. Step 3: Cross multiply
    38,757.47x = 53,485.38 × 21,990.47
  4. Step 4: Simplify right side
    38,757.47x = 1,176,168,376.90
  5. Step 5: Solve for x
    x = 1,176,168,376.90/38,757.47
  6. Step 6: Final answer
    x = 30,346.89

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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.