Home / 15,204.31-20,981.75-8,490.05

Finding the Fourth Proportional to 15,204.31, 20,981.75 and 8,490.05

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Solution

The fourth proportional to 15,204.31, 20,981.75 and 8,490.05 is: 11,716.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,204.31 : 20,981.75 = 8,490.05 : x
  2. Step 2: Convert to fraction form
    15,204.31/20,981.75 = 8,490.05/x
  3. Step 3: Cross multiply
    15,204.31x = 20,981.75 × 8,490.05
  4. Step 4: Simplify right side
    15,204.31x = 178,136,106.59
  5. Step 5: Solve for x
    x = 178,136,106.59/15,204.31
  6. Step 6: Final answer
    x = 11,716.16

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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.