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Finding the Fourth Proportional to 139,848.80, 209,539.92 and 98,221.28

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Solution

The fourth proportional to 139,848.80, 209,539.92 and 98,221.28 is: 147,168.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,848.80 : 209,539.92 = 98,221.28 : x
  2. Step 2: Convert to fraction form
    139,848.80/209,539.92 = 98,221.28/x
  3. Step 3: Cross multiply
    139,848.80x = 209,539.92 × 98,221.28
  4. Step 4: Simplify right side
    139,848.80x = 20,581,279,153.50
  5. Step 5: Solve for x
    x = 20,581,279,153.50/139,848.80
  6. Step 6: Final answer
    x = 147,168.08

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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.