Home / 129,528.11-178,717.69-72,939.49

Finding the Fourth Proportional to 129,528.11, 178,717.69 and 72,939.49

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Solution

The fourth proportional to 129,528.11, 178,717.69 and 72,939.49 is: 100,638.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,528.11 : 178,717.69 = 72,939.49 : x
  2. Step 2: Convert to fraction form
    129,528.11/178,717.69 = 72,939.49/x
  3. Step 3: Cross multiply
    129,528.11x = 178,717.69 × 72,939.49
  4. Step 4: Simplify right side
    129,528.11x = 13,035,576,806.96
  5. Step 5: Solve for x
    x = 13,035,576,806.96/129,528.11
  6. Step 6: Final answer
    x = 100,638.98

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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.