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Finding the Third Proportional to 56,784 and 90,720

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Solution

The third proportional to 56,784 and 90,720 is: 144,937.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,784 : 90,720 = 90,720 : x
  2. Step 2: Convert to fraction form
    56,784/90,720 = 90,720/x
  3. Step 3: Cross multiply
    56,784x = 90,720 × 90,720
  4. Step 4: Simplify right side
    56,784x = 8,230,118,400
  5. Step 5: Solve for x
    x = 8,230,118,400/56,784
  6. Step 6: Final answer
    x = 144,937.28

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.