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Finding the Fourth Proportional to 78,449.64, 108,260.66 and 42,639.56

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Solution

The fourth proportional to 78,449.64, 108,260.66 and 42,639.56 is: 58,842.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,449.64 : 108,260.66 = 42,639.56 : x
  2. Step 2: Convert to fraction form
    78,449.64/108,260.66 = 42,639.56/x
  3. Step 3: Cross multiply
    78,449.64x = 108,260.66 × 42,639.56
  4. Step 4: Simplify right side
    78,449.64x = 4,616,186,907.71
  5. Step 5: Solve for x
    x = 4,616,186,907.71/78,449.64
  6. Step 6: Final answer
    x = 58,842.68

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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.