Home / 129,381.09-178,510.05-77,684.76

Finding the Fourth Proportional to 129,381.09, 178,510.05 and 77,684.76

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Solution

The fourth proportional to 129,381.09, 178,510.05 and 77,684.76 is: 107,183.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,381.09 : 178,510.05 = 77,684.76 : x
  2. Step 2: Convert to fraction form
    129,381.09/178,510.05 = 77,684.76/x
  3. Step 3: Cross multiply
    129,381.09x = 178,510.05 × 77,684.76
  4. Step 4: Simplify right side
    129,381.09x = 13,867,510,391.84
  5. Step 5: Solve for x
    x = 13,867,510,391.84/129,381.09
  6. Step 6: Final answer
    x = 107,183.44

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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.