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Finding the Fourth Proportional to 104,678.80, 156,989.40 and 42,355.60

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Solution

The fourth proportional to 104,678.80, 156,989.40 and 42,355.60 is: 63,521.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    104,678.80 : 156,989.40 = 42,355.60 : x
  2. Step 2: Convert to fraction form
    104,678.80/156,989.40 = 42,355.60/x
  3. Step 3: Cross multiply
    104,678.80x = 156,989.40 × 42,355.60
  4. Step 4: Simplify right side
    104,678.80x = 6,649,380,230.64
  5. Step 5: Solve for x
    x = 6,649,380,230.64/104,678.80
  6. Step 6: Final answer
    x = 63,521.75

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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.