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Finding the Fourth Proportional to 128,909.70, 193,364.55 and 86,919.30

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Solution

The fourth proportional to 128,909.70, 193,364.55 and 86,919.30 is: 130,378.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909.70 : 193,364.55 = 86,919.30 : x
  2. Step 2: Convert to fraction form
    128,909.70/193,364.55 = 86,919.30/x
  3. Step 3: Cross multiply
    128,909.70x = 193,364.55 × 86,919.30
  4. Step 4: Simplify right side
    128,909.70x = 16,807,111,330.82
  5. Step 5: Solve for x
    x = 16,807,111,330.82/128,909.70
  6. Step 6: Final answer
    x = 130,378.95

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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.