Home / 15,399.81-21,251.64-8,685.50

Finding the Fourth Proportional to 15,399.81, 21,251.64 and 8,685.50

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Solution

The fourth proportional to 15,399.81, 21,251.64 and 8,685.50 is: 11,985.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,399.81 : 21,251.64 = 8,685.50 : x
  2. Step 2: Convert to fraction form
    15,399.81/21,251.64 = 8,685.50/x
  3. Step 3: Cross multiply
    15,399.81x = 21,251.64 × 8,685.50
  4. Step 4: Simplify right side
    15,399.81x = 184,581,119.22
  5. Step 5: Solve for x
    x = 184,581,119.22/15,399.81
  6. Step 6: Final answer
    x = 11,985.93

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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.