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Finding the Fourth Proportional to 128,211.16, 176,931.78 and 71,624.68

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Solution

The fourth proportional to 128,211.16, 176,931.78 and 71,624.68 is: 98,842.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,211.16 : 176,931.78 = 71,624.68 : x
  2. Step 2: Convert to fraction form
    128,211.16/176,931.78 = 71,624.68/x
  3. Step 3: Cross multiply
    128,211.16x = 176,931.78 × 71,624.68
  4. Step 4: Simplify right side
    128,211.16x = 12,672,682,124.33
  5. Step 5: Solve for x
    x = 12,672,682,124.33/128,211.16
  6. Step 6: Final answer
    x = 98,842.27

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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.