Home / 12,905.28-17,819.32-9,916.40

Finding the Fourth Proportional to 12,905.28, 17,819.32 and 9,916.40

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Solution

The fourth proportional to 12,905.28, 17,819.32 and 9,916.40 is: 13,692.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.28 : 17,819.32 = 9,916.40 : x
  2. Step 2: Convert to fraction form
    12,905.28/17,819.32 = 9,916.40/x
  3. Step 3: Cross multiply
    12,905.28x = 17,819.32 × 9,916.40
  4. Step 4: Simplify right side
    12,905.28x = 176,703,504.85
  5. Step 5: Solve for x
    x = 176,703,504.85/12,905.28
  6. Step 6: Final answer
    x = 13,692.34

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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.