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Finding the Third Proportional to 30,428 and 40,700

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Solution

The third proportional to 30,428 and 40,700 is: 54,439.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,428 : 40,700 = 40,700 : x
  2. Step 2: Convert to fraction form
    30,428/40,700 = 40,700/x
  3. Step 3: Cross multiply
    30,428x = 40,700 × 40,700
  4. Step 4: Simplify right side
    30,428x = 1,656,490,000
  5. Step 5: Solve for x
    x = 1,656,490,000/30,428
  6. Step 6: Final answer
    x = 54,439.66

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.