Home / 13,140.77-18,134.31-7,172.57

Finding the Fourth Proportional to 13,140.77, 18,134.31 and 7,172.57

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Solution

The fourth proportional to 13,140.77, 18,134.31 and 7,172.57 is: 9,898.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.77 : 18,134.31 = 7,172.57 : x
  2. Step 2: Convert to fraction form
    13,140.77/18,134.31 = 7,172.57/x
  3. Step 3: Cross multiply
    13,140.77x = 18,134.31 × 7,172.57
  4. Step 4: Simplify right side
    13,140.77x = 130,069,481.34
  5. Step 5: Solve for x
    x = 130,069,481.34/13,140.77
  6. Step 6: Final answer
    x = 9,898.17

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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.