Home / 13,352.78-18,420.57-8,638.58

Finding the Fourth Proportional to 13,352.78, 18,420.57 and 8,638.58

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Solution

The fourth proportional to 13,352.78, 18,420.57 and 8,638.58 is: 11,917.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,352.78 : 18,420.57 = 8,638.58 : x
  2. Step 2: Convert to fraction form
    13,352.78/18,420.57 = 8,638.58/x
  3. Step 3: Cross multiply
    13,352.78x = 18,420.57 × 8,638.58
  4. Step 4: Simplify right side
    13,352.78x = 159,127,567.59
  5. Step 5: Solve for x
    x = 159,127,567.59/13,352.78
  6. Step 6: Final answer
    x = 11,917.19

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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.