Home / 15,685.28-21,647.41-8,971.54

Finding the Fourth Proportional to 15,685.28, 21,647.41 and 8,971.54

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Solution

The fourth proportional to 15,685.28, 21,647.41 and 8,971.54 is: 12,381.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.28 : 21,647.41 = 8,971.54 : x
  2. Step 2: Convert to fraction form
    15,685.28/21,647.41 = 8,971.54/x
  3. Step 3: Cross multiply
    15,685.28x = 21,647.41 × 8,971.54
  4. Step 4: Simplify right side
    15,685.28x = 194,210,496.47
  5. Step 5: Solve for x
    x = 194,210,496.47/15,685.28
  6. Step 6: Final answer
    x = 12,381.70

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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.