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Finding the Fourth Proportional to 30,449.40, 42,020.40 and 17,021.20

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Solution

The fourth proportional to 30,449.40, 42,020.40 and 17,021.20 is: 23,489.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,449.40 : 42,020.40 = 17,021.20 : x
  2. Step 2: Convert to fraction form
    30,449.40/42,020.40 = 17,021.20/x
  3. Step 3: Cross multiply
    30,449.40x = 42,020.40 × 17,021.20
  4. Step 4: Simplify right side
    30,449.40x = 715,237,632.48
  5. Step 5: Solve for x
    x = 715,237,632.48/30,449.40
  6. Step 6: Final answer
    x = 23,489.38

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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.