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Finding the Fourth Proportional to 78,425.28, 108,226.66 and 42,615.28

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Solution

The fourth proportional to 78,425.28, 108,226.66 and 42,615.28 is: 58,808.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,425.28 : 108,226.66 = 42,615.28 : x
  2. Step 2: Convert to fraction form
    78,425.28/108,226.66 = 42,615.28/x
  3. Step 3: Cross multiply
    78,425.28x = 108,226.66 × 42,615.28
  4. Step 4: Simplify right side
    78,425.28x = 4,612,109,419.36
  5. Step 5: Solve for x
    x = 4,612,109,419.36/78,425.28
  6. Step 6: Final answer
    x = 58,808.96

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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.