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Finding the Fourth Proportional to 112,028.60, 168,042.90 and 86,659.40

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Solution

The fourth proportional to 112,028.60, 168,042.90 and 86,659.40 is: 129,989.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,028.60 : 168,042.90 = 86,659.40 : x
  2. Step 2: Convert to fraction form
    112,028.60/168,042.90 = 86,659.40/x
  3. Step 3: Cross multiply
    112,028.60x = 168,042.90 × 86,659.40
  4. Step 4: Simplify right side
    112,028.60x = 14,562,496,888.26
  5. Step 5: Solve for x
    x = 14,562,496,888.26/112,028.60
  6. Step 6: Final answer
    x = 129,989.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.