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Finding the Fourth Proportional to 859,761.90, 1,289,314.80 and 260,523.90

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Solution

The fourth proportional to 859,761.90, 1,289,314.80 and 260,523.90 is: 390,686.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,761.90 : 1,289,314.80 = 260,523.90 : x
  2. Step 2: Convert to fraction form
    859,761.90/1,289,314.80 = 260,523.90/x
  3. Step 3: Cross multiply
    859,761.90x = 1,289,314.80 × 260,523.90
  4. Step 4: Simplify right side
    859,761.90x = 335,897,320,023.72
  5. Step 5: Solve for x
    x = 335,897,320,023.72/859,761.90
  6. Step 6: Final answer
    x = 390,686.44

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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.