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Finding the Fourth Proportional to 557,185, 768,915.30 and 318,721

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Solution

The fourth proportional to 557,185, 768,915.30 and 318,721 is: 439,834.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    557,185 : 768,915.30 = 318,721 : x
  2. Step 2: Convert to fraction form
    557,185/768,915.30 = 318,721/x
  3. Step 3: Cross multiply
    557,185x = 768,915.30 × 318,721
  4. Step 4: Simplify right side
    557,185x = 245,069,453,331.30
  5. Step 5: Solve for x
    x = 245,069,453,331.30/557,185
  6. Step 6: Final answer
    x = 439,834.98

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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.