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Finding the Fourth Proportional to 30,939.60, 42,693.02 and 17,328.36

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Solution

The fourth proportional to 30,939.60, 42,693.02 and 17,328.36 is: 23,911.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.60 : 42,693.02 = 17,328.36 : x
  2. Step 2: Convert to fraction form
    30,939.60/42,693.02 = 17,328.36/x
  3. Step 3: Cross multiply
    30,939.60x = 42,693.02 × 17,328.36
  4. Step 4: Simplify right side
    30,939.60x = 739,800,020.05
  5. Step 5: Solve for x
    x = 739,800,020.05/30,939.60
  6. Step 6: Final answer
    x = 23,911.10

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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.