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Finding the Third Proportional to 90,272.81 and 139,709.81

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Solution

The third proportional to 90,272.81 and 139,709.81 is: 216,220.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,272.81 : 139,709.81 = 139,709.81 : x
  2. Step 2: Convert to fraction form
    90,272.81/139,709.81 = 139,709.81/x
  3. Step 3: Cross multiply
    90,272.81x = 139,709.81 × 139,709.81
  4. Step 4: Simplify right side
    90,272.81x = 19,518,831,708.79
  5. Step 5: Solve for x
    x = 19,518,831,708.79/90,272.81
  6. Step 6: Final answer
    x = 216,220.49

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.