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Finding the Fourth Proportional to 28,246.40, 38,978.72 and 15,499.27

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Solution

The fourth proportional to 28,246.40, 38,978.72 and 15,499.27 is: 21,388.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,246.40 : 38,978.72 = 15,499.27 : x
  2. Step 2: Convert to fraction form
    28,246.40/38,978.72 = 15,499.27/x
  3. Step 3: Cross multiply
    28,246.40x = 38,978.72 × 15,499.27
  4. Step 4: Simplify right side
    28,246.40x = 604,141,646.84
  5. Step 5: Solve for x
    x = 604,141,646.84/28,246.40
  6. Step 6: Final answer
    x = 21,388.27

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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.