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Finding the Fourth Proportional to 128,249, 176,980.32 and 71,660.84

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Solution

The fourth proportional to 128,249, 176,980.32 and 71,660.84 is: 98,890.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,249 : 176,980.32 = 71,660.84 : x
  2. Step 2: Convert to fraction form
    128,249/176,980.32 = 71,660.84/x
  3. Step 3: Cross multiply
    128,249x = 176,980.32 × 71,660.84
  4. Step 4: Simplify right side
    128,249x = 12,682,558,394.67
  5. Step 5: Solve for x
    x = 12,682,558,394.67/128,249
  6. Step 6: Final answer
    x = 98,890.12

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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.