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Finding the Fourth Proportional to 70,438.45, 105,654.93 and 28,305.91

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Solution

The fourth proportional to 70,438.45, 105,654.93 and 28,305.91 is: 42,457.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,438.45 : 105,654.93 = 28,305.91 : x
  2. Step 2: Convert to fraction form
    70,438.45/105,654.93 = 28,305.91/x
  3. Step 3: Cross multiply
    70,438.45x = 105,654.93 × 28,305.91
  4. Step 4: Simplify right side
    70,438.45x = 2,990,658,939.64
  5. Step 5: Solve for x
    x = 2,990,658,939.64/70,438.45
  6. Step 6: Final answer
    x = 42,457.76

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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.