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Finding the Fourth Proportional to 128,315.46, 177,081.48 and 70,953.78

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Solution

The fourth proportional to 128,315.46, 177,081.48 and 70,953.78 is: 97,919.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,315.46 : 177,081.48 = 70,953.78 : x
  2. Step 2: Convert to fraction form
    128,315.46/177,081.48 = 70,953.78/x
  3. Step 3: Cross multiply
    128,315.46x = 177,081.48 × 70,953.78
  4. Step 4: Simplify right side
    128,315.46x = 12,564,600,373.99
  5. Step 5: Solve for x
    x = 12,564,600,373.99/128,315.46
  6. Step 6: Final answer
    x = 97,919.61

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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.