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Finding the Fourth Proportional to 78,637.44, 108,520.96 and 42,828.16

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Solution

The fourth proportional to 78,637.44, 108,520.96 and 42,828.16 is: 59,103.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,637.44 : 108,520.96 = 42,828.16 : x
  2. Step 2: Convert to fraction form
    78,637.44/108,520.96 = 42,828.16/x
  3. Step 3: Cross multiply
    78,637.44x = 108,520.96 × 42,828.16
  4. Step 4: Simplify right side
    78,637.44x = 4,647,753,038.23
  5. Step 5: Solve for x
    x = 4,647,753,038.23/78,637.44
  6. Step 6: Final answer
    x = 59,103.56

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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.