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Finding the Fourth Proportional to 21,400.80, 29,902.80 and 21,400.80

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Solution

The fourth proportional to 21,400.80, 29,902.80 and 21,400.80 is: 29,902.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,400.80 : 29,902.80 = 21,400.80 : x
  2. Step 2: Convert to fraction form
    21,400.80/29,902.80 = 21,400.80/x
  3. Step 3: Cross multiply
    21,400.80x = 29,902.80 × 21,400.80
  4. Step 4: Simplify right side
    21,400.80x = 639,943,842.24
  5. Step 5: Solve for x
    x = 639,943,842.24/21,400.80
  6. Step 6: Final answer
    x = 29,902.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.