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Finding the Fourth Proportional to 687,155.83, 948,388.87 and 381,330.44

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Solution

The fourth proportional to 687,155.83, 948,388.87 and 381,330.44 is: 526,299.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,155.83 : 948,388.87 = 381,330.44 : x
  2. Step 2: Convert to fraction form
    687,155.83/948,388.87 = 381,330.44/x
  3. Step 3: Cross multiply
    687,155.83x = 948,388.87 × 381,330.44
  4. Step 4: Simplify right side
    687,155.83x = 361,649,545,437.99
  5. Step 5: Solve for x
    x = 361,649,545,437.99/687,155.83
  6. Step 6: Final answer
    x = 526,299.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.