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Finding the Fourth Proportional to 87,648.61, 120,912.80 and 57,420.62

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Solution

The fourth proportional to 87,648.61, 120,912.80 and 57,420.62 is: 79,212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,648.61 : 120,912.80 = 57,420.62 : x
  2. Step 2: Convert to fraction form
    87,648.61/120,912.80 = 57,420.62/x
  3. Step 3: Cross multiply
    87,648.61x = 120,912.80 × 57,420.62
  4. Step 4: Simplify right side
    87,648.61x = 6,942,887,941.94
  5. Step 5: Solve for x
    x = 6,942,887,941.94/87,648.61
  6. Step 6: Final answer
    x = 79,212.76

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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.