Home / 13,128.16-18,125.40-10,138.72

Finding the Fourth Proportional to 13,128.16, 18,125.40 and 10,138.72

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Solution

The fourth proportional to 13,128.16, 18,125.40 and 10,138.72 is: 13,998.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.16 : 18,125.40 = 10,138.72 : x
  2. Step 2: Convert to fraction form
    13,128.16/18,125.40 = 10,138.72/x
  3. Step 3: Cross multiply
    13,128.16x = 18,125.40 × 10,138.72
  4. Step 4: Simplify right side
    13,128.16x = 183,768,355.49
  5. Step 5: Solve for x
    x = 183,768,355.49/13,128.16
  6. Step 6: Final answer
    x = 13,998.03

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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.