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Finding the Fourth Proportional to 212,611.47, 318,909.21 and 52,687.87

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Solution

The fourth proportional to 212,611.47, 318,909.21 and 52,687.87 is: 79,029.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,611.47 : 318,909.21 = 52,687.87 : x
  2. Step 2: Convert to fraction form
    212,611.47/318,909.21 = 52,687.87/x
  3. Step 3: Cross multiply
    212,611.47x = 318,909.21 × 52,687.87
  4. Step 4: Simplify right side
    212,611.47x = 16,802,646,373.89
  5. Step 5: Solve for x
    x = 16,802,646,373.89/212,611.47
  6. Step 6: Final answer
    x = 79,029.82

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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.