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Finding the Fourth Proportional to 207,317.86, 310,779.75 and 81,039.06

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Solution

The fourth proportional to 207,317.86, 310,779.75 and 81,039.06 is: 121,481.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,317.86 : 310,779.75 = 81,039.06 : x
  2. Step 2: Convert to fraction form
    207,317.86/310,779.75 = 81,039.06/x
  3. Step 3: Cross multiply
    207,317.86x = 310,779.75 × 81,039.06
  4. Step 4: Simplify right side
    207,317.86x = 25,185,298,807.04
  5. Step 5: Solve for x
    x = 25,185,298,807.04/207,317.86
  6. Step 6: Final answer
    x = 121,481.57

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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.