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Finding the Fourth Proportional to 21,138.04, 31,707.06 and 7,287.04

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Solution

The fourth proportional to 21,138.04, 31,707.06 and 7,287.04 is: 10,930.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.04 : 31,707.06 = 7,287.04 : x
  2. Step 2: Convert to fraction form
    21,138.04/31,707.06 = 7,287.04/x
  3. Step 3: Cross multiply
    21,138.04x = 31,707.06 × 7,287.04
  4. Step 4: Simplify right side
    21,138.04x = 231,050,614.50
  5. Step 5: Solve for x
    x = 231,050,614.50/21,138.04
  6. Step 6: Final answer
    x = 10,930.56

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Double scale
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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.