Home / 136,009.60-187,639.51-78,638.42

Finding the Fourth Proportional to 136,009.60, 187,639.51 and 78,638.42

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Solution

The fourth proportional to 136,009.60, 187,639.51 and 78,638.42 is: 108,489.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,009.60 : 187,639.51 = 78,638.42 : x
  2. Step 2: Convert to fraction form
    136,009.60/187,639.51 = 78,638.42/x
  3. Step 3: Cross multiply
    136,009.60x = 187,639.51 × 78,638.42
  4. Step 4: Simplify right side
    136,009.60x = 14,755,673,960.45
  5. Step 5: Solve for x
    x = 14,755,673,960.45/136,009.60
  6. Step 6: Final answer
    x = 108,489.94

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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.