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Finding the Fourth Proportional to 76,987.70, 107,938.30 and 76,987.70

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Solution

The fourth proportional to 76,987.70, 107,938.30 and 76,987.70 is: 107,938.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,987.70 : 107,938.30 = 76,987.70 : x
  2. Step 2: Convert to fraction form
    76,987.70/107,938.30 = 76,987.70/x
  3. Step 3: Cross multiply
    76,987.70x = 107,938.30 × 76,987.70
  4. Step 4: Simplify right side
    76,987.70x = 8,309,921,458.91
  5. Step 5: Solve for x
    x = 8,309,921,458.91/76,987.70
  6. Step 6: Final answer
    x = 107,938.30

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1.5x scale

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.