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Finding the Fourth Proportional to 687,187.86, 948,287.11 and 381,260.98

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Solution

The fourth proportional to 687,187.86, 948,287.11 and 381,260.98 is: 526,122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,187.86 : 948,287.11 = 381,260.98 : x
  2. Step 2: Convert to fraction form
    687,187.86/948,287.11 = 381,260.98/x
  3. Step 3: Cross multiply
    687,187.86x = 948,287.11 × 381,260.98
  4. Step 4: Simplify right side
    687,187.86x = 361,544,872,879.97
  5. Step 5: Solve for x
    x = 361,544,872,879.97/687,187.86
  6. Step 6: Final answer
    x = 526,122.32

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1.5x scale

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.