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Finding the Fourth Proportional to 30,576.89, 42,190.20 and 18,474.89

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Solution

The fourth proportional to 30,576.89, 42,190.20 and 18,474.89 is: 25,491.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,576.89 : 42,190.20 = 18,474.89 : x
  2. Step 2: Convert to fraction form
    30,576.89/42,190.20 = 18,474.89/x
  3. Step 3: Cross multiply
    30,576.89x = 42,190.20 × 18,474.89
  4. Step 4: Simplify right side
    30,576.89x = 779,459,093.13
  5. Step 5: Solve for x
    x = 779,459,093.13/30,576.89
  6. Step 6: Final answer
    x = 25,491.77

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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.