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Finding the Fourth Proportional to 612,139.20, 917,771.40 and 274,903.80

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Solution

The fourth proportional to 612,139.20, 917,771.40 and 274,903.80 is: 412,159.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,139.20 : 917,771.40 = 274,903.80 : x
  2. Step 2: Convert to fraction form
    612,139.20/917,771.40 = 274,903.80/x
  3. Step 3: Cross multiply
    612,139.20x = 917,771.40 × 274,903.80
  4. Step 4: Simplify right side
    612,139.20x = 252,298,845,391.32
  5. Step 5: Solve for x
    x = 252,298,845,391.32/612,139.20
  6. Step 6: Final answer
    x = 412,159.27

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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.