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Finding the Third Proportional to 74,979 and 156,840

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Solution

The third proportional to 74,979 and 156,840 is: 328,075.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,979 : 156,840 = 156,840 : x
  2. Step 2: Convert to fraction form
    74,979/156,840 = 156,840/x
  3. Step 3: Cross multiply
    74,979x = 156,840 × 156,840
  4. Step 4: Simplify right side
    74,979x = 24,598,785,600
  5. Step 5: Solve for x
    x = 24,598,785,600/74,979
  6. Step 6: Final answer
    x = 328,075.67

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.