Home / 13,638.40-18,811.20-9,598.72

Finding the Fourth Proportional to 13,638.40, 18,811.20 and 9,598.72

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Solution

The fourth proportional to 13,638.40, 18,811.20 and 9,598.72 is: 13,239.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.40 : 18,811.20 = 9,598.72 : x
  2. Step 2: Convert to fraction form
    13,638.40/18,811.20 = 9,598.72/x
  3. Step 3: Cross multiply
    13,638.40x = 18,811.20 × 9,598.72
  4. Step 4: Simplify right side
    13,638.40x = 180,563,441.66
  5. Step 5: Solve for x
    x = 180,563,441.66/13,638.40
  6. Step 6: Final answer
    x = 13,239.34

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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.