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Finding the Fourth Proportional to 30,886.56, 42,628.03 and 19,557.11

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Solution

The fourth proportional to 30,886.56, 42,628.03 and 19,557.11 is: 26,991.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,886.56 : 42,628.03 = 19,557.11 : x
  2. Step 2: Convert to fraction form
    30,886.56/42,628.03 = 19,557.11/x
  3. Step 3: Cross multiply
    30,886.56x = 42,628.03 × 19,557.11
  4. Step 4: Simplify right side
    30,886.56x = 833,681,071.79
  5. Step 5: Solve for x
    x = 833,681,071.79/30,886.56
  6. Step 6: Final answer
    x = 26,991.71

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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.