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Finding the Fourth Proportional to 136,101.12, 187,765.61 and 78,729.80

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Solution

The fourth proportional to 136,101.12, 187,765.61 and 78,729.80 is: 108,615.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,101.12 : 187,765.61 = 78,729.80 : x
  2. Step 2: Convert to fraction form
    136,101.12/187,765.61 = 78,729.80/x
  3. Step 3: Cross multiply
    136,101.12x = 187,765.61 × 78,729.80
  4. Step 4: Simplify right side
    136,101.12x = 14,782,748,228.51
  5. Step 5: Solve for x
    x = 14,782,748,228.51/136,101.12
  6. Step 6: Final answer
    x = 108,615.92

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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.