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Finding the Fourth Proportional to 851,791.20, 1,277,686.80 and 782,978.40

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Solution

The fourth proportional to 851,791.20, 1,277,686.80 and 782,978.40 is: 1,174,467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    851,791.20 : 1,277,686.80 = 782,978.40 : x
  2. Step 2: Convert to fraction form
    851,791.20/1,277,686.80 = 782,978.40/x
  3. Step 3: Cross multiply
    851,791.20x = 1,277,686.80 × 782,978.40
  4. Step 4: Simplify right side
    851,791.20x = 1,000,401,166,365.12
  5. Step 5: Solve for x
    x = 1,000,401,166,365.12/851,791.20
  6. Step 6: Final answer
    x = 1,174,467.60

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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.