Home / 15,428.20-21,290.81-8,354.46

Finding the Fourth Proportional to 15,428.20, 21,290.81 and 8,354.46

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Solution

The fourth proportional to 15,428.20, 21,290.81 and 8,354.46 is: 11,529.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,428.20 : 21,290.81 = 8,354.46 : x
  2. Step 2: Convert to fraction form
    15,428.20/21,290.81 = 8,354.46/x
  3. Step 3: Cross multiply
    15,428.20x = 21,290.81 × 8,354.46
  4. Step 4: Simplify right side
    15,428.20x = 177,873,220.51
  5. Step 5: Solve for x
    x = 177,873,220.51/15,428.20
  6. Step 6: Final answer
    x = 11,529.10

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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.