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Finding the Fourth Proportional to 285,211.80, 427,817.70 and 272,089.80

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Solution

The fourth proportional to 285,211.80, 427,817.70 and 272,089.80 is: 408,134.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,211.80 : 427,817.70 = 272,089.80 : x
  2. Step 2: Convert to fraction form
    285,211.80/427,817.70 = 272,089.80/x
  3. Step 3: Cross multiply
    285,211.80x = 427,817.70 × 272,089.80
  4. Step 4: Simplify right side
    285,211.80x = 116,404,832,429.46
  5. Step 5: Solve for x
    x = 116,404,832,429.46/285,211.80
  6. Step 6: Final answer
    x = 408,134.70

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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.