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Finding the Fourth Proportional to 21,063.12, 31,605.12 and 11,703.12

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Solution

The fourth proportional to 21,063.12, 31,605.12 and 11,703.12 is: 17,560.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,063.12 : 31,605.12 = 11,703.12 : x
  2. Step 2: Convert to fraction form
    21,063.12/31,605.12 = 11,703.12/x
  3. Step 3: Cross multiply
    21,063.12x = 31,605.12 × 11,703.12
  4. Step 4: Simplify right side
    21,063.12x = 369,878,511.97
  5. Step 5: Solve for x
    x = 369,878,511.97/21,063.12
  6. Step 6: Final answer
    x = 17,560.48

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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.