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Finding the Fourth Proportional to 859,682.70, 1,289,534.85 and 260,649.90

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Solution

The fourth proportional to 859,682.70, 1,289,534.85 and 260,649.90 is: 390,978.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,682.70 : 1,289,534.85 = 260,649.90 : x
  2. Step 2: Convert to fraction form
    859,682.70/1,289,534.85 = 260,649.90/x
  3. Step 3: Cross multiply
    859,682.70x = 1,289,534.85 × 260,649.90
  4. Step 4: Simplify right side
    859,682.70x = 336,117,129,699.02
  5. Step 5: Solve for x
    x = 336,117,129,699.02/859,682.70
  6. Step 6: Final answer
    x = 390,978.12

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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.