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Finding the Third Proportional to 420,374 and 634,920

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Solution

The third proportional to 420,374 and 634,920 is: 958,963.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,374 : 634,920 = 634,920 : x
  2. Step 2: Convert to fraction form
    420,374/634,920 = 634,920/x
  3. Step 3: Cross multiply
    420,374x = 634,920 × 634,920
  4. Step 4: Simplify right side
    420,374x = 403,123,406,400
  5. Step 5: Solve for x
    x = 403,123,406,400/420,374
  6. Step 6: Final answer
    x = 958,963.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.