Home / 135,990.09-187,612.58-78,618.86

Finding the Fourth Proportional to 135,990.09, 187,612.58 and 78,618.86

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Solution

The fourth proportional to 135,990.09, 187,612.58 and 78,618.86 is: 108,462.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,990.09 : 187,612.58 = 78,618.86 : x
  2. Step 2: Convert to fraction form
    135,990.09/187,612.58 = 78,618.86/x
  3. Step 3: Cross multiply
    135,990.09x = 187,612.58 × 78,618.86
  4. Step 4: Simplify right side
    135,990.09x = 14,749,887,161.26
  5. Step 5: Solve for x
    x = 14,749,887,161.26/135,990.09
  6. Step 6: Final answer
    x = 108,462.96

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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.