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Finding the Fourth Proportional to 30,123.68, 45,187.85 and 7,936.79

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Solution

The fourth proportional to 30,123.68, 45,187.85 and 7,936.79 is: 11,905.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,123.68 : 45,187.85 = 7,936.79 : x
  2. Step 2: Convert to fraction form
    30,123.68/45,187.85 = 7,936.79/x
  3. Step 3: Cross multiply
    30,123.68x = 45,187.85 × 7,936.79
  4. Step 4: Simplify right side
    30,123.68x = 358,646,608.81
  5. Step 5: Solve for x
    x = 358,646,608.81/30,123.68
  6. Step 6: Final answer
    x = 11,905.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.