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Finding the Fourth Proportional to 715,915.80, 987,967.71 and 421,578.36

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Solution

The fourth proportional to 715,915.80, 987,967.71 and 421,578.36 is: 581,780.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,915.80 : 987,967.71 = 421,578.36 : x
  2. Step 2: Convert to fraction form
    715,915.80/987,967.71 = 421,578.36/x
  3. Step 3: Cross multiply
    715,915.80x = 987,967.71 × 421,578.36
  4. Step 4: Simplify right side
    715,915.80x = 416,505,806,914.76
  5. Step 5: Solve for x
    x = 416,505,806,914.76/715,915.80
  6. Step 6: Final answer
    x = 581,780.44

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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.