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Finding the Fourth Proportional to 140,356.83, 210,479.21 and 81,234.02

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Solution

The fourth proportional to 140,356.83, 210,479.21 and 81,234.02 is: 121,818.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,356.83 : 210,479.21 = 81,234.02 : x
  2. Step 2: Convert to fraction form
    140,356.83/210,479.21 = 81,234.02/x
  3. Step 3: Cross multiply
    140,356.83x = 210,479.21 × 81,234.02
  4. Step 4: Simplify right side
    140,356.83x = 17,098,072,779.38
  5. Step 5: Solve for x
    x = 17,098,072,779.38/140,356.83
  6. Step 6: Final answer
    x = 121,818.60

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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.