Home / 30,516.78-42,118.14-20,948.76

Finding the Fourth Proportional to 30,516.78, 42,118.14 and 20,948.76

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Solution

The fourth proportional to 30,516.78, 42,118.14 and 20,948.76 is: 28,912.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,516.78 : 42,118.14 = 20,948.76 : x
  2. Step 2: Convert to fraction form
    30,516.78/42,118.14 = 20,948.76/x
  3. Step 3: Cross multiply
    30,516.78x = 42,118.14 × 20,948.76
  4. Step 4: Simplify right side
    30,516.78x = 882,322,806.51
  5. Step 5: Solve for x
    x = 882,322,806.51/30,516.78
  6. Step 6: Final answer
    x = 28,912.71

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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.