Home / 15,619.89-21,555.23-8,905.29

Finding the Fourth Proportional to 15,619.89, 21,555.23 and 8,905.29

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Solution

The fourth proportional to 15,619.89, 21,555.23 and 8,905.29 is: 12,289.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,619.89 : 21,555.23 = 8,905.29 : x
  2. Step 2: Convert to fraction form
    15,619.89/21,555.23 = 8,905.29/x
  3. Step 3: Cross multiply
    15,619.89x = 21,555.23 × 8,905.29
  4. Step 4: Simplify right side
    15,619.89x = 191,955,574.17
  5. Step 5: Solve for x
    x = 191,955,574.17/15,619.89
  6. Step 6: Final answer
    x = 12,289.18

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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.