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Finding the Fourth Proportional to 109,381.80, 164,072.70 and 90,719.40

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Solution

The fourth proportional to 109,381.80, 164,072.70 and 90,719.40 is: 136,079.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,381.80 : 164,072.70 = 90,719.40 : x
  2. Step 2: Convert to fraction form
    109,381.80/164,072.70 = 90,719.40/x
  3. Step 3: Cross multiply
    109,381.80x = 164,072.70 × 90,719.40
  4. Step 4: Simplify right side
    109,381.80x = 14,884,576,900.38
  5. Step 5: Solve for x
    x = 14,884,576,900.38/109,381.80
  6. Step 6: Final answer
    x = 136,079.10

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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.