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Finding the Fourth Proportional to 78,446.85, 108,257.30 and 42,636.88

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Solution

The fourth proportional to 78,446.85, 108,257.30 and 42,636.88 is: 58,839.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,446.85 : 108,257.30 = 42,636.88 : x
  2. Step 2: Convert to fraction form
    78,446.85/108,257.30 = 42,636.88/x
  3. Step 3: Cross multiply
    78,446.85x = 108,257.30 × 42,636.88
  4. Step 4: Simplify right side
    78,446.85x = 4,615,753,509.22
  5. Step 5: Solve for x
    x = 4,615,753,509.22/78,446.85
  6. Step 6: Final answer
    x = 58,839.25

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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.