Home / 30,685.36-42,366.36-20,628.76

Finding the Fourth Proportional to 30,685.36, 42,366.36 and 20,628.76

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Solution

The fourth proportional to 30,685.36, 42,366.36 and 20,628.76 is: 28,481.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,685.36 : 42,366.36 = 20,628.76 : x
  2. Step 2: Convert to fraction form
    30,685.36/42,366.36 = 20,628.76/x
  3. Step 3: Cross multiply
    30,685.36x = 42,366.36 × 20,628.76
  4. Step 4: Simplify right side
    30,685.36x = 873,965,472.51
  5. Step 5: Solve for x
    x = 873,965,472.51/30,685.36
  6. Step 6: Final answer
    x = 28,481.51

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Half scale
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Double scale
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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.