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Finding the Fourth Proportional to 128,874.84, 177,848.64 and 72,285

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Solution

The fourth proportional to 128,874.84, 177,848.64 and 72,285 is: 99,754.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,874.84 : 177,848.64 = 72,285 : x
  2. Step 2: Convert to fraction form
    128,874.84/177,848.64 = 72,285/x
  3. Step 3: Cross multiply
    128,874.84x = 177,848.64 × 72,285
  4. Step 4: Simplify right side
    128,874.84x = 12,855,788,942.40
  5. Step 5: Solve for x
    x = 12,855,788,942.40/128,874.84
  6. Step 6: Final answer
    x = 99,754.06

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1.5x scale

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.