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Finding the Fourth Proportional to 128,894.40, 193,341.60 and 76,276.80

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Solution

The fourth proportional to 128,894.40, 193,341.60 and 76,276.80 is: 114,415.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,894.40 : 193,341.60 = 76,276.80 : x
  2. Step 2: Convert to fraction form
    128,894.40/193,341.60 = 76,276.80/x
  3. Step 3: Cross multiply
    128,894.40x = 193,341.60 × 76,276.80
  4. Step 4: Simplify right side
    128,894.40x = 14,747,478,554.88
  5. Step 5: Solve for x
    x = 14,747,478,554.88/128,894.40
  6. Step 6: Final answer
    x = 114,415.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.