Home / 21,292.80-29,385.12-11,861.28

Finding the Fourth Proportional to 21,292.80, 29,385.12 and 11,861.28

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Solution

The fourth proportional to 21,292.80, 29,385.12 and 11,861.28 is: 16,369.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,292.80 : 29,385.12 = 11,861.28 : x
  2. Step 2: Convert to fraction form
    21,292.80/29,385.12 = 11,861.28/x
  3. Step 3: Cross multiply
    21,292.80x = 29,385.12 × 11,861.28
  4. Step 4: Simplify right side
    21,292.80x = 348,545,136.15
  5. Step 5: Solve for x
    x = 348,545,136.15/21,292.80
  6. Step 6: Final answer
    x = 16,369.15

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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.