Home / 129,345.92-178,513.84-72,768.16

Finding the Fourth Proportional to 129,345.92, 178,513.84 and 72,768.16

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Solution

The fourth proportional to 129,345.92, 178,513.84 and 72,768.16 is: 100,429.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,345.92 : 178,513.84 = 72,768.16 : x
  2. Step 2: Convert to fraction form
    129,345.92/178,513.84 = 72,768.16/x
  3. Step 3: Cross multiply
    129,345.92x = 178,513.84 × 72,768.16
  4. Step 4: Simplify right side
    129,345.92x = 12,990,123,671.33
  5. Step 5: Solve for x
    x = 12,990,123,671.33/129,345.92
  6. Step 6: Final answer
    x = 100,429.33

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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.