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Finding the Fourth Proportional to 128,714.72, 177,631.12 and 72,124

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Solution

The fourth proportional to 128,714.72, 177,631.12 and 72,124 is: 99,533.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,714.72 : 177,631.12 = 72,124 : x
  2. Step 2: Convert to fraction form
    128,714.72/177,631.12 = 72,124/x
  3. Step 3: Cross multiply
    128,714.72x = 177,631.12 × 72,124
  4. Step 4: Simplify right side
    128,714.72x = 12,811,466,898.88
  5. Step 5: Solve for x
    x = 12,811,466,898.88/128,714.72
  6. Step 6: Final answer
    x = 99,533.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.