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Finding the Fourth Proportional to 28,245.68, 38,978.52 and 15,670.16

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Solution

The fourth proportional to 28,245.68, 38,978.52 and 15,670.16 is: 21,624.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.68 : 38,978.52 = 15,670.16 : x
  2. Step 2: Convert to fraction form
    28,245.68/38,978.52 = 15,670.16/x
  3. Step 3: Cross multiply
    28,245.68x = 38,978.52 × 15,670.16
  4. Step 4: Simplify right side
    28,245.68x = 610,799,644.96
  5. Step 5: Solve for x
    x = 610,799,644.96/28,245.68
  6. Step 6: Final answer
    x = 21,624.53

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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.