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Finding the Fourth Proportional to 65,891.28, 90,926.28 and 39,036.36

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Solution

The fourth proportional to 65,891.28, 90,926.28 and 39,036.36 is: 53,867.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,891.28 : 90,926.28 = 39,036.36 : x
  2. Step 2: Convert to fraction form
    65,891.28/90,926.28 = 39,036.36/x
  3. Step 3: Cross multiply
    65,891.28x = 90,926.28 × 39,036.36
  4. Step 4: Simplify right side
    65,891.28x = 3,549,430,999.54
  5. Step 5: Solve for x
    x = 3,549,430,999.54/65,891.28
  6. Step 6: Final answer
    x = 53,867.99

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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.