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Finding the Fourth Proportional to 128,807.70, 193,211.55 and 109,780.80

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Solution

The fourth proportional to 128,807.70, 193,211.55 and 109,780.80 is: 164,671.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,807.70 : 193,211.55 = 109,780.80 : x
  2. Step 2: Convert to fraction form
    128,807.70/193,211.55 = 109,780.80/x
  3. Step 3: Cross multiply
    128,807.70x = 193,211.55 × 109,780.80
  4. Step 4: Simplify right side
    128,807.70x = 21,210,918,528.24
  5. Step 5: Solve for x
    x = 21,210,918,528.24/128,807.70
  6. Step 6: Final answer
    x = 164,671.20

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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.