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Finding the Fourth Proportional to 612,211.70, 918,317.55 and 442,937.90

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Solution

The fourth proportional to 612,211.70, 918,317.55 and 442,937.90 is: 664,406.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,211.70 : 918,317.55 = 442,937.90 : x
  2. Step 2: Convert to fraction form
    612,211.70/918,317.55 = 442,937.90/x
  3. Step 3: Cross multiply
    612,211.70x = 918,317.55 × 442,937.90
  4. Step 4: Simplify right side
    612,211.70x = 406,757,647,130.15
  5. Step 5: Solve for x
    x = 406,757,647,130.15/612,211.70
  6. Step 6: Final answer
    x = 664,406.85

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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.