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Finding the Fourth Proportional to 70,561.50, 105,815.54 and 28,427.28

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Solution

The fourth proportional to 70,561.50, 105,815.54 and 28,427.28 is: 42,630.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,561.50 : 105,815.54 = 28,427.28 : x
  2. Step 2: Convert to fraction form
    70,561.50/105,815.54 = 28,427.28/x
  3. Step 3: Cross multiply
    70,561.50x = 105,815.54 × 28,427.28
  4. Step 4: Simplify right side
    70,561.50x = 3,008,047,983.93
  5. Step 5: Solve for x
    x = 3,008,047,983.93/70,561.50
  6. Step 6: Final answer
    x = 42,630.16

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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.