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Finding the Fourth Proportional to 112,499.80, 168,749.70 and 86,255.80

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Solution

The fourth proportional to 112,499.80, 168,749.70 and 86,255.80 is: 129,383.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,499.80 : 168,749.70 = 86,255.80 : x
  2. Step 2: Convert to fraction form
    112,499.80/168,749.70 = 86,255.80/x
  3. Step 3: Cross multiply
    112,499.80x = 168,749.70 × 86,255.80
  4. Step 4: Simplify right side
    112,499.80x = 14,555,640,373.26
  5. Step 5: Solve for x
    x = 14,555,640,373.26/112,499.80
  6. Step 6: Final answer
    x = 129,383.70

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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.