Home / 15,513.49-21,408.78-8,439.92

Finding the Fourth Proportional to 15,513.49, 21,408.78 and 8,439.92

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Solution

The fourth proportional to 15,513.49, 21,408.78 and 8,439.92 is: 11,647.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,513.49 : 21,408.78 = 8,439.92 : x
  2. Step 2: Convert to fraction form
    15,513.49/21,408.78 = 8,439.92/x
  3. Step 3: Cross multiply
    15,513.49x = 21,408.78 × 8,439.92
  4. Step 4: Simplify right side
    15,513.49x = 180,688,390.50
  5. Step 5: Solve for x
    x = 180,688,390.50/15,513.49
  6. Step 6: Final answer
    x = 11,647.18

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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.