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Finding the Fourth Proportional to 21,053.28, 31,583.04 and 7,008.72

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Solution

The fourth proportional to 21,053.28, 31,583.04 and 7,008.72 is: 10,514.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,053.28 : 31,583.04 = 7,008.72 : x
  2. Step 2: Convert to fraction form
    21,053.28/31,583.04 = 7,008.72/x
  3. Step 3: Cross multiply
    21,053.28x = 31,583.04 × 7,008.72
  4. Step 4: Simplify right side
    21,053.28x = 221,356,684.11
  5. Step 5: Solve for x
    x = 221,356,684.11/21,053.28
  6. Step 6: Final answer
    x = 10,514.12

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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.