Home / 13,140.90-18,134.10-7,172.64

Finding the Fourth Proportional to 13,140.90, 18,134.10 and 7,172.64

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Solution

The fourth proportional to 13,140.90, 18,134.10 and 7,172.64 is: 9,898.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.90 : 18,134.10 = 7,172.64 : x
  2. Step 2: Convert to fraction form
    13,140.90/18,134.10 = 7,172.64/x
  3. Step 3: Cross multiply
    13,140.90x = 18,134.10 × 7,172.64
  4. Step 4: Simplify right side
    13,140.90x = 130,069,371.02
  5. Step 5: Solve for x
    x = 130,069,371.02/13,140.90
  6. Step 6: Final answer
    x = 9,898.06

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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.