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Finding the Fourth Proportional to 78,920.50, 108,913.54 and 45,386.50

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Solution

The fourth proportional to 78,920.50, 108,913.54 and 45,386.50 is: 62,635.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.50 : 108,913.54 = 45,386.50 : x
  2. Step 2: Convert to fraction form
    78,920.50/108,913.54 = 45,386.50/x
  3. Step 3: Cross multiply
    78,920.50x = 108,913.54 × 45,386.50
  4. Step 4: Simplify right side
    78,920.50x = 4,943,204,383.21
  5. Step 5: Solve for x
    x = 4,943,204,383.21/78,920.50
  6. Step 6: Final answer
    x = 62,635.24

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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.