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Finding the Fourth Proportional to 30,939.52, 42,692.16 and 18,369.28

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Solution

The fourth proportional to 30,939.52, 42,692.16 and 18,369.28 is: 25,347.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.52 : 42,692.16 = 18,369.28 : x
  2. Step 2: Convert to fraction form
    30,939.52/42,692.16 = 18,369.28/x
  3. Step 3: Cross multiply
    30,939.52x = 42,692.16 × 18,369.28
  4. Step 4: Simplify right side
    30,939.52x = 784,224,240.84
  5. Step 5: Solve for x
    x = 784,224,240.84/30,939.52
  6. Step 6: Final answer
    x = 25,347.01

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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.