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Finding the Fourth Proportional to 28,246.14, 38,978.93 and 15,499.28

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Solution

The fourth proportional to 28,246.14, 38,978.93 and 15,499.28 is: 21,388.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,246.14 : 38,978.93 = 15,499.28 : x
  2. Step 2: Convert to fraction form
    28,246.14/38,978.93 = 15,499.28/x
  3. Step 3: Cross multiply
    28,246.14x = 38,978.93 × 15,499.28
  4. Step 4: Simplify right side
    28,246.14x = 604,145,486.37
  5. Step 5: Solve for x
    x = 604,145,486.37/28,246.14
  6. Step 6: Final answer
    x = 21,388.60

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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.