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Finding the Fourth Proportional to 859,872.76, 1,289,665.13 and 260,690.64

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Solution

The fourth proportional to 859,872.76, 1,289,665.13 and 260,690.64 is: 390,992.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    859,872.76 : 1,289,665.13 = 260,690.64 : x
  2. Step 2: Convert to fraction form
    859,872.76/1,289,665.13 = 260,690.64/x
  3. Step 3: Cross multiply
    859,872.76x = 1,289,665.13 × 260,690.64
  4. Step 4: Simplify right side
    859,872.76x = 336,203,628,125.38
  5. Step 5: Solve for x
    x = 336,203,628,125.38/859,872.76
  6. Step 6: Final answer
    x = 390,992.30

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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.