Home / 21,152.13-31,728.70-7,112.34

Finding the Fourth Proportional to 21,152.13, 31,728.70 and 7,112.34

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Solution

The fourth proportional to 21,152.13, 31,728.70 and 7,112.34 is: 10,668.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,152.13 : 31,728.70 = 7,112.34 : x
  2. Step 2: Convert to fraction form
    21,152.13/31,728.70 = 7,112.34/x
  3. Step 3: Cross multiply
    21,152.13x = 31,728.70 × 7,112.34
  4. Step 4: Simplify right side
    21,152.13x = 225,665,302.16
  5. Step 5: Solve for x
    x = 225,665,302.16/21,152.13
  6. Step 6: Final answer
    x = 10,668.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.