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Finding the Fourth Proportional to 30,621, 42,260.22 and 19,443

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Solution

The fourth proportional to 30,621, 42,260.22 and 19,443 is: 26,833.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,621 : 42,260.22 = 19,443 : x
  2. Step 2: Convert to fraction form
    30,621/42,260.22 = 19,443/x
  3. Step 3: Cross multiply
    30,621x = 42,260.22 × 19,443
  4. Step 4: Simplify right side
    30,621x = 821,665,457.46
  5. Step 5: Solve for x
    x = 821,665,457.46/30,621
  6. Step 6: Final answer
    x = 26,833.40

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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.