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Finding the Fourth Proportional to 28,143.92, 38,835.12 and 15,568.64

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Solution

The fourth proportional to 28,143.92, 38,835.12 and 15,568.64 is: 21,482.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,143.92 : 38,835.12 = 15,568.64 : x
  2. Step 2: Convert to fraction form
    28,143.92/38,835.12 = 15,568.64/x
  3. Step 3: Cross multiply
    28,143.92x = 38,835.12 × 15,568.64
  4. Step 4: Simplify right side
    28,143.92x = 604,610,002.64
  5. Step 5: Solve for x
    x = 604,610,002.64/28,143.92
  6. Step 6: Final answer
    x = 21,482.79

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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.