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Finding the Fourth Proportional to 109,428.70, 164,143.05 and 74,436.70

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Solution

The fourth proportional to 109,428.70, 164,143.05 and 74,436.70 is: 111,655.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,428.70 : 164,143.05 = 74,436.70 : x
  2. Step 2: Convert to fraction form
    109,428.70/164,143.05 = 74,436.70/x
  3. Step 3: Cross multiply
    109,428.70x = 164,143.05 × 74,436.70
  4. Step 4: Simplify right side
    109,428.70x = 12,218,266,969.94
  5. Step 5: Solve for x
    x = 12,218,266,969.94/109,428.70
  6. Step 6: Final answer
    x = 111,655.05

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1.5x scale

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.