Home / 15,513.64-21,408.30-8,439.88

Finding the Fourth Proportional to 15,513.64, 21,408.30 and 8,439.88

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Solution

The fourth proportional to 15,513.64, 21,408.30 and 8,439.88 is: 11,646.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,513.64 : 21,408.30 = 8,439.88 : x
  2. Step 2: Convert to fraction form
    15,513.64/21,408.30 = 8,439.88/x
  3. Step 3: Cross multiply
    15,513.64x = 21,408.30 × 8,439.88
  4. Step 4: Simplify right side
    15,513.64x = 180,683,483.00
  5. Step 5: Solve for x
    x = 180,683,483.00/15,513.64
  6. Step 6: Final answer
    x = 11,646.75

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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.