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Finding the Fourth Proportional to 113,712.80, 170,709.60 and 71,592.80

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Solution

The fourth proportional to 113,712.80, 170,709.60 and 71,592.80 is: 107,477.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,712.80 : 170,709.60 = 71,592.80 : x
  2. Step 2: Convert to fraction form
    113,712.80/170,709.60 = 71,592.80/x
  3. Step 3: Cross multiply
    113,712.80x = 170,709.60 × 71,592.80
  4. Step 4: Simplify right side
    113,712.80x = 12,221,578,250.88
  5. Step 5: Solve for x
    x = 12,221,578,250.88/113,712.80
  6. Step 6: Final answer
    x = 107,477.59

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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.