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Finding the Fourth Proportional to 642,186.72, 963,877.86 and 326,879.64

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Solution

The fourth proportional to 642,186.72, 963,877.86 and 326,879.64 is: 490,623.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,186.72 : 963,877.86 = 326,879.64 : x
  2. Step 2: Convert to fraction form
    642,186.72/963,877.86 = 326,879.64/x
  3. Step 3: Cross multiply
    642,186.72x = 963,877.86 × 326,879.64
  4. Step 4: Simplify right side
    642,186.72x = 315,072,047,880.77
  5. Step 5: Solve for x
    x = 315,072,047,880.77/642,186.72
  6. Step 6: Final answer
    x = 490,623.74

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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.