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Finding the Fourth Proportional to 70,485.30, 105,769.23 and 28,358.82

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Solution

The fourth proportional to 70,485.30, 105,769.23 and 28,358.82 is: 42,554.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,485.30 : 105,769.23 = 28,358.82 : x
  2. Step 2: Convert to fraction form
    70,485.30/105,769.23 = 28,358.82/x
  3. Step 3: Cross multiply
    70,485.30x = 105,769.23 × 28,358.82
  4. Step 4: Simplify right side
    70,485.30x = 2,999,490,555.11
  5. Step 5: Solve for x
    x = 2,999,490,555.11/70,485.30
  6. Step 6: Final answer
    x = 42,554.84

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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.