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Finding the Fourth Proportional to 136,808.70, 188,781.64 and 79,436.80

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Solution

The fourth proportional to 136,808.70, 188,781.64 and 79,436.80 is: 109,614.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,808.70 : 188,781.64 = 79,436.80 : x
  2. Step 2: Convert to fraction form
    136,808.70/188,781.64 = 79,436.80/x
  3. Step 3: Cross multiply
    136,808.70x = 188,781.64 × 79,436.80
  4. Step 4: Simplify right side
    136,808.70x = 14,996,209,417.74
  5. Step 5: Solve for x
    x = 14,996,209,417.74/136,808.70
  6. Step 6: Final answer
    x = 109,614.45

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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.