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Finding the Third Proportional to 30,389.50 and 65,639

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Solution

The third proportional to 30,389.50 and 65,639 is: 141,775.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,389.50 : 65,639 = 65,639 : x
  2. Step 2: Convert to fraction form
    30,389.50/65,639 = 65,639/x
  3. Step 3: Cross multiply
    30,389.50x = 65,639 × 65,639
  4. Step 4: Simplify right side
    30,389.50x = 4,308,478,321
  5. Step 5: Solve for x
    x = 4,308,478,321/30,389.50
  6. Step 6: Final answer
    x = 141,775.23

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.