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Finding the Fourth Proportional to 717,880.86, 990,671.34 and 391,193.28

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Solution

The fourth proportional to 717,880.86, 990,671.34 and 391,193.28 is: 539,844.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,880.86 : 990,671.34 = 391,193.28 : x
  2. Step 2: Convert to fraction form
    717,880.86/990,671.34 = 391,193.28/x
  3. Step 3: Cross multiply
    717,880.86x = 990,671.34 × 391,193.28
  4. Step 4: Simplify right side
    717,880.86x = 387,543,970,896.60
  5. Step 5: Solve for x
    x = 387,543,970,896.60/717,880.86
  6. Step 6: Final answer
    x = 539,844.41

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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.