Home / 13,428.78-18,510.18-9,120.54

Finding the Fourth Proportional to 13,428.78, 18,510.18 and 9,120.54

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Solution

The fourth proportional to 13,428.78, 18,510.18 and 9,120.54 is: 12,571.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,428.78 : 18,510.18 = 9,120.54 : x
  2. Step 2: Convert to fraction form
    13,428.78/18,510.18 = 9,120.54/x
  3. Step 3: Cross multiply
    13,428.78x = 18,510.18 × 9,120.54
  4. Step 4: Simplify right side
    13,428.78x = 168,822,837.10
  5. Step 5: Solve for x
    x = 168,822,837.10/13,428.78
  6. Step 6: Final answer
    x = 12,571.72

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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.