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Finding the Fourth Proportional to 162,129.60, 243,064.80 and 68,558.40

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Solution

The fourth proportional to 162,129.60, 243,064.80 and 68,558.40 is: 102,782.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    162,129.60 : 243,064.80 = 68,558.40 : x
  2. Step 2: Convert to fraction form
    162,129.60/243,064.80 = 68,558.40/x
  3. Step 3: Cross multiply
    162,129.60x = 243,064.80 × 68,558.40
  4. Step 4: Simplify right side
    162,129.60x = 16,664,133,784.32
  5. Step 5: Solve for x
    x = 16,664,133,784.32/162,129.60
  6. Step 6: Final answer
    x = 102,782.80

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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.