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Finding the Fourth Proportional to 128,309.66, 192,513.82 and 90,395.40

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Solution

The fourth proportional to 128,309.66, 192,513.82 and 90,395.40 is: 135,627.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,309.66 : 192,513.82 = 90,395.40 : x
  2. Step 2: Convert to fraction form
    128,309.66/192,513.82 = 90,395.40/x
  3. Step 3: Cross multiply
    128,309.66x = 192,513.82 × 90,395.40
  4. Step 4: Simplify right side
    128,309.66x = 17,402,363,764.43
  5. Step 5: Solve for x
    x = 17,402,363,764.43/128,309.66
  6. Step 6: Final answer
    x = 135,627.85

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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.