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Finding the Fourth Proportional to 91,900,145.70, 128,983,054.39 and 91,900,145.70

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Solution

The fourth proportional to 91,900,145.70, 128,983,054.39 and 91,900,145.70 is: 128,983,054.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,900,145.70 : 128,983,054.39 = 91,900,145.70 : x
  2. Step 2: Convert to fraction form
    91,900,145.70/128,983,054.39 = 91,900,145.70/x
  3. Step 3: Cross multiply
    91,900,145.70x = 128,983,054.39 × 91,900,145.70
  4. Step 4: Simplify right side
    91,900,145.70x = 11,853,561,491,042,274
  5. Step 5: Solve for x
    x = 11,853,561,491,042,274/91,900,145.70
  6. Step 6: Final answer
    x = 128,983,054.39

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.