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Finding the Fourth Proportional to 128,298.88, 177,056.32 and 71,708.80

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Solution

The fourth proportional to 128,298.88, 177,056.32 and 71,708.80 is: 98,960.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,298.88 : 177,056.32 = 71,708.80 : x
  2. Step 2: Convert to fraction form
    128,298.88/177,056.32 = 71,708.80/x
  3. Step 3: Cross multiply
    128,298.88x = 177,056.32 × 71,708.80
  4. Step 4: Simplify right side
    128,298.88x = 12,696,496,239.62
  5. Step 5: Solve for x
    x = 12,696,496,239.62/128,298.88
  6. Step 6: Final answer
    x = 98,960.30

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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.