Home / 13,128.21-18,103.10-9,303.39

Finding the Fourth Proportional to 13,128.21, 18,103.10 and 9,303.39

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Solution

The fourth proportional to 13,128.21, 18,103.10 and 9,303.39 is: 12,828.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.21 : 18,103.10 = 9,303.39 : x
  2. Step 2: Convert to fraction form
    13,128.21/18,103.10 = 9,303.39/x
  3. Step 3: Cross multiply
    13,128.21x = 18,103.10 × 9,303.39
  4. Step 4: Simplify right side
    13,128.21x = 168,420,152.99
  5. Step 5: Solve for x
    x = 168,420,152.99/13,128.21
  6. Step 6: Final answer
    x = 12,828.87

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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.