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Finding the Fourth Proportional to 15,876.92, 21,905.69 and 12,509.28

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Solution

The fourth proportional to 15,876.92, 21,905.69 and 12,509.28 is: 17,259.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,876.92 : 21,905.69 = 12,509.28 : x
  2. Step 2: Convert to fraction form
    15,876.92/21,905.69 = 12,509.28/x
  3. Step 3: Cross multiply
    15,876.92x = 21,905.69 × 12,509.28
  4. Step 4: Simplify right side
    15,876.92x = 274,024,409.80
  5. Step 5: Solve for x
    x = 274,024,409.80/15,876.92
  6. Step 6: Final answer
    x = 17,259.29

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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.