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Finding the Fourth Proportional to 70,878.61, 106,362.43 and 28,758.88

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Solution

The fourth proportional to 70,878.61, 106,362.43 and 28,758.88 is: 43,156.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,878.61 : 106,362.43 = 28,758.88 : x
  2. Step 2: Convert to fraction form
    70,878.61/106,362.43 = 28,758.88/x
  3. Step 3: Cross multiply
    70,878.61x = 106,362.43 × 28,758.88
  4. Step 4: Simplify right side
    70,878.61x = 3,058,864,583.70
  5. Step 5: Solve for x
    x = 3,058,864,583.70/70,878.61
  6. Step 6: Final answer
    x = 43,156.38

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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.