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Finding the Fourth Proportional to 78,449.53, 108,261.06 and 42,639.62

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Solution

The fourth proportional to 78,449.53, 108,261.06 and 42,639.62 is: 58,843.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,449.53 : 108,261.06 = 42,639.62 : x
  2. Step 2: Convert to fraction form
    78,449.53/108,261.06 = 42,639.62/x
  3. Step 3: Cross multiply
    78,449.53x = 108,261.06 × 42,639.62
  4. Step 4: Simplify right side
    78,449.53x = 4,616,209,757.99
  5. Step 5: Solve for x
    x = 4,616,209,757.99/78,449.53
  6. Step 6: Final answer
    x = 58,843.05

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1.5x scale

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.