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Finding the Fourth Proportional to 112,420.80, 168,740.40 and 87,729.60

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Solution

The fourth proportional to 112,420.80, 168,740.40 and 87,729.60 is: 131,679.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,420.80 : 168,740.40 = 87,729.60 : x
  2. Step 2: Convert to fraction form
    112,420.80/168,740.40 = 87,729.60/x
  3. Step 3: Cross multiply
    112,420.80x = 168,740.40 × 87,729.60
  4. Step 4: Simplify right side
    112,420.80x = 14,803,527,795.84
  5. Step 5: Solve for x
    x = 14,803,527,795.84/112,420.80
  6. Step 6: Final answer
    x = 131,679.62

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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.