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Finding the Fourth Proportional to 858,897.90, 1,288,346.85 and 809,909.10

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Solution

The fourth proportional to 858,897.90, 1,288,346.85 and 809,909.10 is: 1,214,863.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,897.90 : 1,288,346.85 = 809,909.10 : x
  2. Step 2: Convert to fraction form
    858,897.90/1,288,346.85 = 809,909.10/x
  3. Step 3: Cross multiply
    858,897.90x = 1,288,346.85 × 809,909.10
  4. Step 4: Simplify right side
    858,897.90x = 1,043,443,837,771.34
  5. Step 5: Solve for x
    x = 1,043,443,837,771.34/858,897.90
  6. Step 6: Final answer
    x = 1,214,863.65

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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.