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Finding the Third Proportional to 42,989 and 66,428

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Solution

The third proportional to 42,989 and 66,428 is: 102,646.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,989 : 66,428 = 66,428 : x
  2. Step 2: Convert to fraction form
    42,989/66,428 = 66,428/x
  3. Step 3: Cross multiply
    42,989x = 66,428 × 66,428
  4. Step 4: Simplify right side
    42,989x = 4,412,679,184
  5. Step 5: Solve for x
    x = 4,412,679,184/42,989
  6. Step 6: Final answer
    x = 102,646.70

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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.