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Finding the Third Proportional to 58,420 and 90,356

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Solution

The third proportional to 58,420 and 90,356 is: 139,750.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,420 : 90,356 = 90,356 : x
  2. Step 2: Convert to fraction form
    58,420/90,356 = 90,356/x
  3. Step 3: Cross multiply
    58,420x = 90,356 × 90,356
  4. Step 4: Simplify right side
    58,420x = 8,164,206,736
  5. Step 5: Solve for x
    x = 8,164,206,736/58,420
  6. Step 6: Final answer
    x = 139,750.20

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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.