Home / 10,121.21-13,980.87-9,178.07

Finding the Fourth Proportional to 10,121.21, 13,980.87 and 9,178.07

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Solution

The fourth proportional to 10,121.21, 13,980.87 and 9,178.07 is: 12,678.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,121.21 : 13,980.87 = 9,178.07 : x
  2. Step 2: Convert to fraction form
    10,121.21/13,980.87 = 9,178.07/x
  3. Step 3: Cross multiply
    10,121.21x = 13,980.87 × 9,178.07
  4. Step 4: Simplify right side
    10,121.21x = 128,317,333.62
  5. Step 5: Solve for x
    x = 128,317,333.62/10,121.21
  6. Step 6: Final answer
    x = 12,678.07

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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.