Home / 13,142.19-18,135.55-7,172.72

Finding the Fourth Proportional to 13,142.19, 18,135.55 and 7,172.72

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Solution

The fourth proportional to 13,142.19, 18,135.55 and 7,172.72 is: 9,897.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,142.19 : 18,135.55 = 7,172.72 : x
  2. Step 2: Convert to fraction form
    13,142.19/18,135.55 = 7,172.72/x
  3. Step 3: Cross multiply
    13,142.19x = 18,135.55 × 7,172.72
  4. Step 4: Simplify right side
    13,142.19x = 130,081,095.65
  5. Step 5: Solve for x
    x = 130,081,095.65/13,142.19
  6. Step 6: Final answer
    x = 9,897.98

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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.