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Finding the Fourth Proportional to 128,999.70, 193,499.55 and 87,009.30

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Solution

The fourth proportional to 128,999.70, 193,499.55 and 87,009.30 is: 130,513.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,999.70 : 193,499.55 = 87,009.30 : x
  2. Step 2: Convert to fraction form
    128,999.70/193,499.55 = 87,009.30/x
  3. Step 3: Cross multiply
    128,999.70x = 193,499.55 × 87,009.30
  4. Step 4: Simplify right side
    128,999.70x = 16,836,260,395.82
  5. Step 5: Solve for x
    x = 16,836,260,395.82/128,999.70
  6. Step 6: Final answer
    x = 130,513.95

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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.