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Finding the Third Proportional to 66,478.50 and 139,929

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Solution

The third proportional to 66,478.50 and 139,929 is: 294,533.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,478.50 : 139,929 = 139,929 : x
  2. Step 2: Convert to fraction form
    66,478.50/139,929 = 139,929/x
  3. Step 3: Cross multiply
    66,478.50x = 139,929 × 139,929
  4. Step 4: Simplify right side
    66,478.50x = 19,580,125,041
  5. Step 5: Solve for x
    x = 19,580,125,041/66,478.50
  6. Step 6: Final answer
    x = 294,533.20

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.