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Finding the Fourth Proportional to 124,219.64, 171,536.88 and 78,912.20

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Solution

The fourth proportional to 124,219.64, 171,536.88 and 78,912.20 is: 108,971.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,219.64 : 171,536.88 = 78,912.20 : x
  2. Step 2: Convert to fraction form
    124,219.64/171,536.88 = 78,912.20/x
  3. Step 3: Cross multiply
    124,219.64x = 171,536.88 × 78,912.20
  4. Step 4: Simplify right side
    124,219.64x = 13,536,352,581.94
  5. Step 5: Solve for x
    x = 13,536,352,581.94/124,219.64
  6. Step 6: Final answer
    x = 108,971.11

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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.