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Finding the Fourth Proportional to 70,639.88, 105,947.04 and 28,518.20

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Solution

The fourth proportional to 70,639.88, 105,947.04 and 28,518.20 is: 42,772.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,639.88 : 105,947.04 = 28,518.20 : x
  2. Step 2: Convert to fraction form
    70,639.88/105,947.04 = 28,518.20/x
  3. Step 3: Cross multiply
    70,639.88x = 105,947.04 × 28,518.20
  4. Step 4: Simplify right side
    70,639.88x = 3,021,418,876.13
  5. Step 5: Solve for x
    x = 3,021,418,876.13/70,639.88
  6. Step 6: Final answer
    x = 42,772.14

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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.