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Finding the Fourth Proportional to 21,330.28, 31,995.36 and 7,479.28

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Solution

The fourth proportional to 21,330.28, 31,995.36 and 7,479.28 is: 11,218.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,330.28 : 31,995.36 = 7,479.28 : x
  2. Step 2: Convert to fraction form
    21,330.28/31,995.36 = 7,479.28/x
  3. Step 3: Cross multiply
    21,330.28x = 31,995.36 × 7,479.28
  4. Step 4: Simplify right side
    21,330.28x = 239,302,256.14
  5. Step 5: Solve for x
    x = 239,302,256.14/21,330.28
  6. Step 6: Final answer
    x = 11,218.90

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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.