Home / 13,147.20-18,133.56-9,312.72

Finding the Fourth Proportional to 13,147.20, 18,133.56 and 9,312.72

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Solution

The fourth proportional to 13,147.20, 18,133.56 and 9,312.72 is: 12,844.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,147.20 : 18,133.56 = 9,312.72 : x
  2. Step 2: Convert to fraction form
    13,147.20/18,133.56 = 9,312.72/x
  3. Step 3: Cross multiply
    13,147.20x = 18,133.56 × 9,312.72
  4. Step 4: Simplify right side
    13,147.20x = 168,872,766.88
  5. Step 5: Solve for x
    x = 168,872,766.88/13,147.20
  6. Step 6: Final answer
    x = 12,844.77

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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.