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Finding the Fourth Proportional to 70,428.16, 105,604.08 and 30,939.04

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Solution

The fourth proportional to 70,428.16, 105,604.08 and 30,939.04 is: 46,391.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,428.16 : 105,604.08 = 30,939.04 : x
  2. Step 2: Convert to fraction form
    70,428.16/105,604.08 = 30,939.04/x
  3. Step 3: Cross multiply
    70,428.16x = 105,604.08 × 30,939.04
  4. Step 4: Simplify right side
    70,428.16x = 3,267,288,855.28
  5. Step 5: Solve for x
    x = 3,267,288,855.28/70,428.16
  6. Step 6: Final answer
    x = 46,391.80

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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.