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Finding the Fourth Proportional to 78,913, 108,903.18 and 45,379

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Solution

The fourth proportional to 78,913, 108,903.18 and 45,379 is: 62,624.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,913 : 108,903.18 = 45,379 : x
  2. Step 2: Convert to fraction form
    78,913/108,903.18 = 45,379/x
  3. Step 3: Cross multiply
    78,913x = 108,903.18 × 45,379
  4. Step 4: Simplify right side
    78,913x = 4,941,917,405.22
  5. Step 5: Solve for x
    x = 4,941,917,405.22/78,913
  6. Step 6: Final answer
    x = 62,624.88

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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.