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Finding the Fourth Proportional to 28,164.78, 38,867.67 and 15,589.50

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Solution

The fourth proportional to 28,164.78, 38,867.67 and 15,589.50 is: 21,513.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,164.78 : 38,867.67 = 15,589.50 : x
  2. Step 2: Convert to fraction form
    28,164.78/38,867.67 = 15,589.50/x
  3. Step 3: Cross multiply
    28,164.78x = 38,867.67 × 15,589.50
  4. Step 4: Simplify right side
    28,164.78x = 605,927,541.47
  5. Step 5: Solve for x
    x = 605,927,541.47/28,164.78
  6. Step 6: Final answer
    x = 21,513.66

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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.