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Finding the Fourth Proportional to 30,551.79, 42,117.31 and 21,449.44

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Solution

The fourth proportional to 30,551.79, 42,117.31 and 21,449.44 is: 29,569.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,551.79 : 42,117.31 = 21,449.44 : x
  2. Step 2: Convert to fraction form
    30,551.79/42,117.31 = 21,449.44/x
  3. Step 3: Cross multiply
    30,551.79x = 42,117.31 × 21,449.44
  4. Step 4: Simplify right side
    30,551.79x = 903,392,713.81
  5. Step 5: Solve for x
    x = 903,392,713.81/30,551.79
  6. Step 6: Final answer
    x = 29,569.22

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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.