Home / 129,638.89-178,838.07-86,628.94

Finding the Fourth Proportional to 129,638.89, 178,838.07 and 86,628.94

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Solution

The fourth proportional to 129,638.89, 178,838.07 and 86,628.94 is: 119,505.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,638.89 : 178,838.07 = 86,628.94 : x
  2. Step 2: Convert to fraction form
    129,638.89/178,838.07 = 86,628.94/x
  3. Step 3: Cross multiply
    129,638.89x = 178,838.07 × 86,628.94
  4. Step 4: Simplify right side
    129,638.89x = 15,492,551,541.56
  5. Step 5: Solve for x
    x = 15,492,551,541.56/129,638.89
  6. Step 6: Final answer
    x = 119,505.44

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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.