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Finding the Fourth Proportional to 76,486.88, 105,545.64 and 42,496.40

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Solution

The fourth proportional to 76,486.88, 105,545.64 and 42,496.40 is: 58,641.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,486.88 : 105,545.64 = 42,496.40 : x
  2. Step 2: Convert to fraction form
    76,486.88/105,545.64 = 42,496.40/x
  3. Step 3: Cross multiply
    76,486.88x = 105,545.64 × 42,496.40
  4. Step 4: Simplify right side
    76,486.88x = 4,485,309,735.70
  5. Step 5: Solve for x
    x = 4,485,309,735.70/76,486.88
  6. Step 6: Final answer
    x = 58,641.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.