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Finding the Fourth Proportional to 15,783.52, 21,780.72 and 8,709.28

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Solution

The fourth proportional to 15,783.52, 21,780.72 and 8,709.28 is: 12,018.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,783.52 : 21,780.72 = 8,709.28 : x
  2. Step 2: Convert to fraction form
    15,783.52/21,780.72 = 8,709.28/x
  3. Step 3: Cross multiply
    15,783.52x = 21,780.72 × 8,709.28
  4. Step 4: Simplify right side
    15,783.52x = 189,694,389.08
  5. Step 5: Solve for x
    x = 189,694,389.08/15,783.52
  6. Step 6: Final answer
    x = 12,018.51

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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.