Home / 15,405.81-21,260.99-8,688.98

Finding the Fourth Proportional to 15,405.81, 21,260.99 and 8,688.98

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Solution

The fourth proportional to 15,405.81, 21,260.99 and 8,688.98 is: 11,991.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.81 : 21,260.99 = 8,688.98 : x
  2. Step 2: Convert to fraction form
    15,405.81/21,260.99 = 8,688.98/x
  3. Step 3: Cross multiply
    15,405.81x = 21,260.99 × 8,688.98
  4. Step 4: Simplify right side
    15,405.81x = 184,736,316.89
  5. Step 5: Solve for x
    x = 184,736,316.89/15,405.81
  6. Step 6: Final answer
    x = 11,991.34

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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.