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Finding the Fourth Proportional to 136,381.74, 188,175.47 and 78,211.59

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Solution

The fourth proportional to 136,381.74, 188,175.47 and 78,211.59 is: 107,914.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,381.74 : 188,175.47 = 78,211.59 : x
  2. Step 2: Convert to fraction form
    136,381.74/188,175.47 = 78,211.59/x
  3. Step 3: Cross multiply
    136,381.74x = 188,175.47 × 78,211.59
  4. Step 4: Simplify right side
    136,381.74x = 14,717,502,316.64
  5. Step 5: Solve for x
    x = 14,717,502,316.64/136,381.74
  6. Step 6: Final answer
    x = 107,914.02

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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.