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Finding the Fourth Proportional to 78,889.53, 108,829.68 and 57,345.87

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Solution

The fourth proportional to 78,889.53, 108,829.68 and 57,345.87 is: 79,109.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,889.53 : 108,829.68 = 57,345.87 : x
  2. Step 2: Convert to fraction form
    78,889.53/108,829.68 = 57,345.87/x
  3. Step 3: Cross multiply
    78,889.53x = 108,829.68 × 57,345.87
  4. Step 4: Simplify right side
    78,889.53x = 6,240,932,874.49
  5. Step 5: Solve for x
    x = 6,240,932,874.49/78,889.53
  6. Step 6: Final answer
    x = 79,109.77

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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.