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Finding the Fourth Proportional to 865,355, 1,193,414.18 and 720,640

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Solution

The fourth proportional to 865,355, 1,193,414.18 and 720,640 is: 993,837.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,355 : 1,193,414.18 = 720,640 : x
  2. Step 2: Convert to fraction form
    865,355/1,193,414.18 = 720,640/x
  3. Step 3: Cross multiply
    865,355x = 1,193,414.18 × 720,640
  4. Step 4: Simplify right side
    865,355x = 860,021,994,675.20
  5. Step 5: Solve for x
    x = 860,021,994,675.20/865,355
  6. Step 6: Final answer
    x = 993,837.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.