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Finding the Fourth Proportional to 21,291.80, 29,386.12 and 12,344.48

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Solution

The fourth proportional to 21,291.80, 29,386.12 and 12,344.48 is: 17,037.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,291.80 : 29,386.12 = 12,344.48 : x
  2. Step 2: Convert to fraction form
    21,291.80/29,386.12 = 12,344.48/x
  3. Step 3: Cross multiply
    21,291.80x = 29,386.12 × 12,344.48
  4. Step 4: Simplify right side
    21,291.80x = 362,756,370.62
  5. Step 5: Solve for x
    x = 362,756,370.62/21,291.80
  6. Step 6: Final answer
    x = 17,037.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.